An Astrometric Calibration of Population II Distance Indicators

Details An Astrometric Calibration of Population II Distance Indicators An Astrometric Calibration of Population II Distance Indicators

Jul 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008hst..prop11789b&link_type=abstract

HST Proposal ID #11789. Cycle 17

Astronomy and Astrophysics

Astrophysics

1

Scientific paper

In 2002 HST produced a highly precise parallax for RR Lyrae. That measurement resulted in an absolute magnitude, M{V}= 0.61+/-0.11, a useful result, judged by the over ten refereed citations each year since. It is, however, unsatisfactory to have the direct, parallax-based, distance scale of Population II variables based on a single star. We propose, therefore, to obtain the parallaxes of four additional RR Lyrae stars and two Population II Cepheids, or W Vir stars. The Population II Cepheids lie with the RR Lyrae stars on a common K-band Period-Luminosity relation. Using these parallaxes to inform that relationship, we anticipate a zero-point error of 0.04 magnitude. This result should greatly strengthen confidence in the Population II distance scale and increase our understanding of RR Lyrae star and Pop II Cepheid astrophysics.;

Affiliated with

Also associated with

No associations

Rating

An Astrometric Calibration of Population II Distance Indicators 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 An Astrometric Calibration of Population II Distance Indicators, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and An Astrometric Calibration of Population II Distance Indicators will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-1320601