Variable stars in the newly discovered Milky Way satellite in Bootes

Details Variable stars in the newly discovered Milky Way satellite in Bootes Variable stars in the newly discovered Milky Way satellite in Bootes

2006-11-09

arxiv.org/abs/astro-ph/0611285v1

Astrophys.J.653:L109-L112,2006

Astronomy and Astrophysics

Astrophysics

Accepted for publication on ApJ Letters

Scientific paper

10.1086/510665

We present $V,I$ light curves for 12 variable stars identified in the newly discovered satellite of the Milky Way in the Bootes constellation (Belokurov et al. 2006).Our sample includes 11 RR Lyrae stars (5 first overtone, 5 fundamental mode and 1 double mode pulsator),and one long period variable close to the galaxy red giant branch tip. The RR Lyrae stars trace very well the average $V$ luminosity of the galaxy horizontal branch, leading to a true distance modulus for the galaxy of $\mu_0$=19.11 $\pm$ 0.08 mag for an assumed metal abundance of [Fe/H]=-2.5 (Monoz et al. 2006), and for $E(B-V)$=0.02 mag. Average periods are =0.69 d and =0.37 d for {\it ab-} and {\it c-} type RR Lyrae stars, respectively, making of Bootes the second pure Oosterhoff type II (OoII) dSph after Ursa Minor. The location of the double mode RR Lyrae (RRd) in the Petersen diagram is consistent with RRd stars in OoII clusters, and corresponds to an intrinsic luminosity of $log L/logL\odot$=1.72 (for Z=10$^{-4}$ and M=0.80 M$\odot$) according to Bono et al. (1996) pulsation models.

Affiliated with

Also associated with

No associations

Rating

Variable stars in the newly discovered Milky Way satellite in Bootes 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 Variable stars in the newly discovered Milky Way satellite in Bootes, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Variable stars in the newly discovered Milky Way satellite in Bootes will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-407055