Hi Friends, My latest blog, about news concerning Cepheid variables and featuring a couple of great pics Patrick took, is up. It's at: http://www.deseretnews.com/blog/47/Nightly-news-astronomy.html Any comments are greatly appreciated. Thanks, Joe
Hi, Great article on Cepheid Variables. Your explanation is clear and understandable for the masses. Keep up Your great blog. Mark ________________________________ From: Joe Bauman <josephmbauman@yahoo.com> To: Utah Astronomy <utah-astronomy@mailman.xmission.com> Sent: Sat, January 15, 2011 1:54:19 AM Subject: [Utah-astronomy] Cepheids Hi Friends, My latest blog, about news concerning Cepheid variables and featuring a couple of great pics Patrick took, is up. It's at: http://www.deseretnews.com/blog/47/Nightly-news-astronomy.html Any comments are greatly appreciated. Thanks, Joe _______________________________________________ Utah-Astronomy mailing list Utah-Astronomy@mailman.xmission.com http://mailman.xmission.com/cgi-bin/mailman/listinfo/utah-astronomy Visit the Photo Gallery: http://www.slas.us/gallery2/main.php Visit the Wiki: http://www.utahastronomy.com
That's very much appreciated, Mark. Thanks! -- Joe --- On Sat, 1/15/11, Mark Shelton <woodturninginc@yahoo.com> wrote:
From: Mark Shelton <woodturninginc@yahoo.com> Subject: Re: [Utah-astronomy] Cepheids To: "Utah Astronomy" <utah-astronomy@mailman.xmission.com> Date: Saturday, January 15, 2011, 12:23 PM Hi, Great article on Cepheid Variables. Your explanation is clear and understandable for the masses. Keep up Your great blog.
Mark
________________________________ From: Joe Bauman <josephmbauman@yahoo.com> To: Utah Astronomy <utah-astronomy@mailman.xmission.com> Sent: Sat, January 15, 2011 1:54:19 AM Subject: [Utah-astronomy] Cepheids
Hi Friends, My latest blog, about news concerning Cepheid variables and featuring a couple of great pics Patrick took, is up. It's at:
http://www.deseretnews.com/blog/47/Nightly-news-astronomy.html
Any comments are greatly appreciated. Thanks, Joe
_______________________________________________ Utah-Astronomy mailing list Utah-Astronomy@mailman.xmission.com http://mailman.xmission.com/cgi-bin/mailman/listinfo/utah-astronomy Visit the Photo Gallery: http://www.slas.us/gallery2/main.php Visit the Wiki: http://www.utahastronomy.com _______________________________________________ Utah-Astronomy mailing list Utah-Astronomy@mailman.xmission.com http://mailman.xmission.com/cgi-bin/mailman/listinfo/utah-astronomy Visit the Photo Gallery: http://www.slas.us/gallery2/main.php Visit the Wiki: http://www.utahastronomy.com
I do hope you all read the link Patrick provided to the NASA release on Cepheids in his newsletter. Thanks to Patrick for his continued e-mailing of news.
It does seem, it is just saying to examine the data more carefully and that the distance data provided by Cepheids is still a good ballpark figure. I does not eliminate them from distance measurements. Hi,
Great article on Cepheid Variables. Your explanation is clear and understandable for the masses. Keep up Your great blog.
Mark
________________________________ From: Joe Bauman <josephmbauman@yahoo.com> To: Utah Astronomy <utah-astronomy@mailman.xmission.com> Sent: Sat, January 15, 2011 1:54:19 AM Subject: [Utah-astronomy] Cepheids
Hi Friends, My latest blog, about news concerning Cepheid variables and featuring a couple of great pics Patrick took, is up. It's at:
http://www.deseretnews.com/blog/47/Nightly-news-astronomy.html
Any comments are greatly appreciated. Thanks, Joe
_______________________________________________ Utah-Astronomy mailing list Utah-Astronomy@mailman.xmission.com http://mailman.xmission.com/cgi-bin/mailman/listinfo/utah-astronomy Visit the Photo Gallery: http://www.slas.us/gallery2/main.php Visit the Wiki: http://www.utahastronomy.com _______________________________________________ Utah-Astronomy mailing list Utah-Astronomy@mailman.xmission.com http://mailman.xmission.com/cgi-bin/mailman/listinfo/utah-astronomy Visit the Photo Gallery: http://www.slas.us/gallery2/main.php Visit the Wiki: http://www.utahastronomy.com
No, it doesn't eliminate the use of Cepheids, but it vastly complicates matters. The distance scale needs to be adjusted, not thrown out. -- Joe --- On Sat, 1/15/11, erikhansen@thebluezone.net <erikhansen@thebluezone.net> wrote:
From: erikhansen@thebluezone.net <erikhansen@thebluezone.net> Subject: Re: [Utah-astronomy] Cepheids To: "Utah Astronomy" <utah-astronomy@mailman.xmission.com> Date: Saturday, January 15, 2011, 12:31 PM
I do hope you all read the link Patrick provided to the NASA release on Cepheids in his newsletter. Thanks to Patrick for his continued e-mailing of news.
It does seem, it is just saying to examine the data more carefully and that the distance data provided by Cepheids is still a good ballpark figure. I does not eliminate them from distance measurements.
Hi,
Great article on Cepheid Variables. Your explanation is clear and understandable for the masses. Keep up Your great blog.
Mark
________________________________ From: Joe Bauman <josephmbauman@yahoo.com> To: Utah Astronomy <utah-astronomy@mailman.xmission.com> Sent: Sat, January 15, 2011 1:54:19 AM Subject: [Utah-astronomy] Cepheids
Hi Friends, My latest blog, about news concerning Cepheid variables and featuring a couple of great pics Patrick took, is up. It's at:
http://www.deseretnews.com/blog/47/Nightly-news-astronomy.html
Any comments are greatly appreciated. Thanks, Joe
_______________________________________________ Utah-Astronomy mailing list Utah-Astronomy@mailman.xmission.com http://mailman.xmission.com/cgi-bin/mailman/listinfo/utah-astronomy Visit the Photo Gallery: http://www.slas.us/gallery2/main.php Visit the Wiki: http://www.utahastronomy.com _______________________________________________ Utah-Astronomy mailing list Utah-Astronomy@mailman.xmission.com http://mailman.xmission.com/cgi-bin/mailman/listinfo/utah-astronomy Visit the Photo Gallery: http://www.slas.us/gallery2/main.php Visit the Wiki: http://www.utahastronomy.com
_______________________________________________ Utah-Astronomy mailing list Utah-Astronomy@mailman.xmission.com http://mailman.xmission.com/cgi-bin/mailman/listinfo/utah-astronomy Visit the Photo Gallery: http://www.slas.us/gallery2/main.php Visit the Wiki: http://www.utahastronomy.com
It complicates it some I am not sure "vastly" is the correct characterization, the gas only will slightly affect to total luminosity. It also does not apply to all Cephieds, they don't mention the scale of the error. But, I doubt it adds much more than 5% error. As a disclaimer I am no statistical mathematician.
No, it doesn't eliminate the use of Cepheids, but it vastly complicates
matters. The distance scale needs to be adjusted, not thrown out. -- Joe
--- On Sat, 1/15/11, erikhansen@thebluezone.net <erikhansen@thebluezone.net> wrote:
From: erikhansen@thebluezone.net <erikhansen@thebluezone.net> Subject: Re: [Utah-astronomy] Cepheids To: "Utah Astronomy" <utah-astronomy@mailman.xmission.com> Date: Saturday, January 15, 2011, 12:31 PM
I do hope you all read the link Patrick provided to the NASA release on Cepheids in his newsletter. Thanks to Patrick for his continued e-mailing of news.
It does seem, it is just saying to examine the data more carefully and that the distance data provided by Cepheids is still a good ballpark figure. I does not eliminate them from distance measurements.
Hi,
Great article on Cepheid Variables. Your explanation is clear and understandable for the masses. Keep up Your great blog.
Mark
________________________________ From: Joe Bauman <josephmbauman@yahoo.com> To: Utah Astronomy <utah-astronomy@mailman.xmission.com> Sent: Sat, January 15, 2011 1:54:19 AM Subject: [Utah-astronomy] Cepheids
Hi Friends, My latest blog, about news concerning Cepheid variables and featuring a couple of great pics Patrick took, is up. It's at:
http://www.deseretnews.com/blog/47/Nightly-news-astronomy.html
Any comments are greatly appreciated. Thanks, Joe
_______________________________________________ Utah-Astronomy mailing list Utah-Astronomy@mailman.xmission.com http://mailman.xmission.com/cgi-bin/mailman/listinfo/utah-astronomy Visit the Photo Gallery: http://www.slas.us/gallery2/main.php Visit the Wiki: http://www.utahastronomy.com _______________________________________________ Utah-Astronomy mailing list Utah-Astronomy@mailman.xmission.com http://mailman.xmission.com/cgi-bin/mailman/listinfo/utah-astronomy Visit the Photo Gallery: http://www.slas.us/gallery2/main.php Visit the Wiki: http://www.utahastronomy.com
_______________________________________________ Utah-Astronomy mailing list Utah-Astronomy@mailman.xmission.com http://mailman.xmission.com/cgi-bin/mailman/listinfo/utah-astronomy Visit the Photo Gallery: http://www.slas.us/gallery2/main.php Visit the Wiki: http://www.utahastronomy.com
_______________________________________________ Utah-Astronomy mailing list Utah-Astronomy@mailman.xmission.com http://mailman.xmission.com/cgi-bin/mailman/listinfo/utah-astronomy Visit the Photo Gallery: http://www.slas.us/gallery2/main.php Visit the Wiki: http://www.utahastronomy.com
Good article. Thanks for the analogy of the shark's fin in describing how the brightness chart of a Cephid looks. I have wondered how scientists were able to determine if the change in a given stars brightness was due to it's "pulse" or to the fact that a planet was passing in front of it. I think there's a problem in determing thru triangulation any star that's more than 100 light years away from us. Too often I have seen different distances attributed to stars in the 100 to 1,000 light year range, depending on publication date. I just wonder how accurate that 890 light year distance to Delta Cephi is. --- On Sat, 1/15/11, Joe Bauman <josephmbauman@yahoo.com> wrote: From: Joe Bauman <josephmbauman@yahoo.com> Subject: [Utah-astronomy] Cepheids To: "Utah Astronomy" <utah-astronomy@mailman.xmission.com> Date: Saturday, January 15, 2011, 1:54 AM Hi Friends, My latest blog, about news concerning Cepheid variables and featuring a couple of great pics Patrick took, is up. It's at: http://www.deseretnews.com/blog/47/Nightly-news-astronomy.html Any comments are greatly appreciated. Thanks, Joe _______________________________________________ Utah-Astronomy mailing list Utah-Astronomy@mailman.xmission.com http://mailman.xmission.com/cgi-bin/mailman/listinfo/utah-astronomy Visit the Photo Gallery: http://www.slas.us/gallery2/main.php Visit the Wiki: http://www.utahastronomy.com
Hi Mike, I think the distance is accurate; it's under 100 l-y away. Best wishes, Joe --- On Sat, 1/15/11, M Wilson <astro_outwest@yahoo.com> wrote:
From: M Wilson <astro_outwest@yahoo.com> Subject: Re: [Utah-astronomy] Cepheids To: "Utah Astronomy" <utah-astronomy@mailman.xmission.com> Date: Saturday, January 15, 2011, 7:13 PM Good article. Thanks for the analogy of the shark's fin in describing how the brightness chart of a Cephid looks. I have wondered how scientists were able to determine if the change in a given stars brightness was due to it's "pulse" or to the fact that a planet was passing in front of it. I think there's a problem in determing thru triangulation any star that's more than 100 light years away from us. Too often I have seen different distances attributed to stars in the 100 to 1,000 light year range, depending on publication date. I just wonder how accurate that 890 light year distance to Delta Cephi is.
--- On Sat, 1/15/11, Joe Bauman <josephmbauman@yahoo.com> wrote:
From: Joe Bauman <josephmbauman@yahoo.com> Subject: [Utah-astronomy] Cepheids To: "Utah Astronomy" <utah-astronomy@mailman.xmission.com> Date: Saturday, January 15, 2011, 1:54 AM
Hi Friends, My latest blog, about news concerning Cepheid variables and featuring a couple of great pics Patrick took, is up. It's at:
http://www.deseretnews.com/blog/47/Nightly-news-astronomy.html
Any comments are greatly appreciated. Thanks, Joe
_______________________________________________ Utah-Astronomy mailing list Utah-Astronomy@mailman.xmission.com http://mailman.xmission.com/cgi-bin/mailman/listinfo/utah-astronomy Visit the Photo Gallery: http://www.slas.us/gallery2/main.php Visit the Wiki: http://www.utahastronomy.com
_______________________________________________ Utah-Astronomy mailing list Utah-Astronomy@mailman.xmission.com http://mailman.xmission.com/cgi-bin/mailman/listinfo/utah-astronomy Visit the Photo Gallery: http://www.slas.us/gallery2/main.php Visit the Wiki: http://www.utahastronomy.com
Replying late, but I finally got a chance to read your blog, Joe. I posted comments, which are also below. Great information as always, Joe. Thanks for the work you do to convey concepts such as this to dummies like me. I especially appreciate the work you put into providing historical background. It will be interesting to see how much of an impact this wrinkle will have for our estimates of the size and age of the universe. While somewhat dated now, Dennis Overbye's book "Lonely Hearts of the Cosmos" (1991) includes an excellent account of the importance of using Cepheid variables as "standard candles" as a starting point for these estimates. I'm sure there are more up-to-date narratives available, but I'm not familiar with them. Thanks again. Kim -----Original Message----- From: utah-astronomy-bounces@mailman.xmission.com [mailto:utah-astronomy-bounces@mailman.xmission.com] On Behalf Of Joe Bauman Sent: Saturday, January 15, 2011 1:54 AM To: Utah Astronomy Subject: [Utah-astronomy] Cepheids Hi Friends, My latest blog, about news concerning Cepheid variables and featuring a couple of great pics Patrick took, is up. It's at: http://www.deseretnews.com/blog/47/Nightly-news-astronomy.html Any comments are greatly appreciated. Thanks, Joe _______________________________________________ Utah-Astronomy mailing list Utah-Astronomy@mailman.xmission.com http://mailman.xmission.com/cgi-bin/mailman/listinfo/utah-astronomy Visit the Photo Gallery: http://www.slas.us/gallery2/main.php Visit the Wiki: http://www.utahastronomy.com ----- No virus found in this message. Checked by AVG - www.avg.com Version: 10.0.1191 / Virus Database: 1435/3380 - Release Date: 01/14/11
Thanks for the information, Kim. I've got the book on my "to buy" list. --- On Sun, 1/16/11, Kim Hyatt <kimharch@cut.net> wrote: From: Kim Hyatt <kimharch@cut.net> Subject: Re: [Utah-astronomy] Cepheids To: "'Utah Astronomy'" <utah-astronomy@mailman.xmission.com> Date: Sunday, January 16, 2011, 4:39 AM Replying late, but I finally got a chance to read your blog, Joe. I posted comments, which are also below. Great information as always, Joe. Thanks for the work you do to convey concepts such as this to dummies like me. I especially appreciate the work you put into providing historical background. It will be interesting to see how much of an impact this wrinkle will have for our estimates of the size and age of the universe. While somewhat dated now, Dennis Overbye's book "Lonely Hearts of the Cosmos" (1991) includes an excellent account of the importance of using Cepheid variables as "standard candles" as a starting point for these estimates. I'm sure there are more up-to-date narratives available, but I'm not familiar with them. Thanks again. Kim -----Original Message----- From: utah-astronomy-bounces@mailman.xmission.com [mailto:utah-astronomy-bounces@mailman.xmission.com] On Behalf Of Joe Bauman Sent: Saturday, January 15, 2011 1:54 AM To: Utah Astronomy Subject: [Utah-astronomy] Cepheids Hi Friends, My latest blog, about news concerning Cepheid variables and featuring a couple of great pics Patrick took, is up. It's at: http://www.deseretnews.com/blog/47/Nightly-news-astronomy.html Any comments are greatly appreciated. Thanks, Joe _______________________________________________ Utah-Astronomy mailing list Utah-Astronomy@mailman.xmission.com http://mailman.xmission.com/cgi-bin/mailman/listinfo/utah-astronomy Visit the Photo Gallery: http://www.slas.us/gallery2/main.php Visit the Wiki: http://www.utahastronomy.com ----- No virus found in this message. Checked by AVG - www.avg.com Version: 10.0.1191 / Virus Database: 1435/3380 - Release Date: 01/14/11 _______________________________________________ Utah-Astronomy mailing list Utah-Astronomy@mailman.xmission.com http://mailman.xmission.com/cgi-bin/mailman/listinfo/utah-astronomy Visit the Photo Gallery: http://www.slas.us/gallery2/main.php Visit the Wiki: http://www.utahastronomy.com
I read the book also, it is the easiest and most straight forward book on cosmology. I recommend it as well. Overby is an interesting person to google for articles as well.
One thing is clear Alan Sandage was the workhorse on Cepheids and the following red shift measurements. Thanks for the information, Kim. I've got the book on my "to buy" list.
--- On Sun, 1/16/11, Kim Hyatt <kimharch@cut.net> wrote:
From: Kim Hyatt <kimharch@cut.net> Subject: Re: [Utah-astronomy] Cepheids To: "'Utah Astronomy'" <utah-astronomy@mailman.xmission.com> Date: Sunday, January 16, 2011, 4:39 AM
Replying late, but I finally got a chance to read your blog, Joe. I posted comments, which are also below.
Great information as always, Joe. Thanks for the work you do to convey concepts such as this to dummies like me. I especially appreciate the work you put into providing historical background. It will be interesting to see how much of an impact this wrinkle will have for our estimates of the size and age of the universe. While somewhat dated now, Dennis Overbye's book "Lonely Hearts of the Cosmos" (1991) includes an excellent account of the importance of using Cepheid variables as "standard candles" as a starting point for these estimates. I'm sure there are more up-to-date narratives available, but I'm not familiar with them.
Thanks again.
Kim
-----Original Message----- From: utah-astronomy-bounces@mailman.xmission.com [mailto:utah-astronomy-bounces@mailman.xmission.com] On Behalf Of Joe Bauman Sent: Saturday, January 15, 2011 1:54 AM To: Utah Astronomy Subject: [Utah-astronomy] Cepheids
Hi Friends, My latest blog, about news concerning Cepheid variables and featuring a couple of great pics Patrick took, is up. It's at:
http://www.deseretnews.com/blog/47/Nightly-news-astronomy.html
Any comments are greatly appreciated. Thanks, Joe
_______________________________________________ Utah-Astronomy mailing list Utah-Astronomy@mailman.xmission.com http://mailman.xmission.com/cgi-bin/mailman/listinfo/utah-astronomy Visit the Photo Gallery: http://www.slas.us/gallery2/main.php Visit the Wiki: http://www.utahastronomy.com
----- No virus found in this message. Checked by AVG - www.avg.com Version: 10.0.1191 / Virus Database: 1435/3380 - Release Date: 01/14/11
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participants (5)
-
erikhansen＠thebluezone.net -
Joe Bauman -
Kim Hyatt -
M Wilson -
Mark Shelton