RR Lyrae Star Metallicities From Caby Photometry

Astronomy and Astrophysics – Astronomy

Scientific paper

Rate now

  [ 0.00 ] – not rated yet Voters 0   Comments 0

Details

13

Stars: Variables: Rr Lyrae, Stars: Abundances, Techniques: Photometric

Scientific paper

Ten RR Lyr stars have been observed at different pulsational phases with Caby photoelectric photometry to calibrate the response of this system to RR Lyr metallicity. As has been done for nonvariable stars, the data are displayed in a color-color diagram of hk vs b-y, where hk=(Ca-b)-(b-y). It is found that the system is much more sensitive to metal abundance than the Stromgren m1 index, and that the system retains good sensitivity even at the hottest phases of pulsation. The data produce lines of constant metallicity on the hk/b-y diagram which are single valued with respect to both b-y and hk. Therefore Caby photometry gives a metallicity which is independent of pulsational phase, a distinct advantage over ΔS and other techniques used to find RR Lyr abundances. This phase independence probably arises from the fact that Caby photometry is concerned largely with total absorption from the Ca K and H lines and the b - y continuum, and not the specific shapes of the hydrogen lines, which can be affected by changes in surface gravity as a function of phase in the pulsation and by emission near maximum light. The metallicity of the RRc star V7S3 Cen is determined to be -0.69±0.2 dex using the Caby technique.

No associations

LandOfFree

Say what you really think

Search LandOfFree.com for scientists and scientific papers. Rate them and share your experience with other people.

Rating

RR Lyrae Star Metallicities From Caby Photometry does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with RR Lyrae Star Metallicities From Caby Photometry, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and RR Lyrae Star Metallicities From Caby Photometry will most certainly appreciate the feedback.

Rate now

     

Profile ID: LFWR-SCP-O-1146209

  Search
All data on this website is collected from public sources. Our data reflects the most accurate information available at the time of publication.