|
| | | | |
| | | |
| Stat |
Members: 3645
Articles: 2'504'585
Articles rated: 2609
24 April 2024 |
|
| | | | |
|
Article overview
| |
|
|
New distances to RAVE stars | | James Binney
; Ben Burnett
; Georges Kordopatis
; Paul J McMillan
; Sanjib Sharma
; Tomaz Zwitter
; Olivier Bienayme
; Joss Bland-Hawthorn
; Matthias Steinmetz
; Gerry Gilmore
; Mary E.K. Williams
; Julio Navarro
; Eva K. Grebel
; Amina Helmi
; Quentin Parker
; Warren A. Reid
; George Seabroke
; Fred Watson
; Rosie F.G. Wyse
; | | Date: |
17 Sep 2013 | | Abstract: | Probability density functions are determined from new stellar parameters for
the distance moduli of stars for which the RAdial Velocity Experiment (RAVE)
has obtained spectra with S/N>=10. The expectation value of distance is larger
than the distance implied by the expectation of distance modulus; the latter is
itself larger than the distance implied by the expectation value of the
parallax. Our parallaxes of Hipparcos stars agree well with the values measured
by Hipparcos, so the expectation of parallax is the most reliable distance
indicator. The latter are improved by taking extinction into account. We
provide one- two- or three-Gaussian fits to the distance pdfs. The effective
temperature absolute-magnitude diagram of our stars is significantly improved
when these pdfs are used to make the diagram. We use the method of kinematic
corrections devised by Schoenrich, Binney & Asplund to check for systematic
errors in our estimators for ordinary stars and confirm the conclusion reached
from the Hipparcos stars that the most reliable distance indicator is the
expectation of parallax. There is an indication that for cool dwarfs and
low-gravity giants <varpi> tends to be larger than the true distance by up to
30 percent. The most satisfactory distances are for dwarfs hotter than 5500 K.
We compare our distances to stars in 13 open clusters with cluster distances
from the literature and find excellent agreement for the dwarfs and indications
that we are over-estimating distances to giants, especially in young clusters.
Taking extinction into account slightly improves results for cluster stars even
though our derived extinctions scatter significantly within a cluster and in
four clusters the mean extinction of clusters stars does not agree with the
cluster’s literature value. Noise in the spectra dominates neither the
uncertainty in distance nor the uncertainty in extinction. | | Source: | arXiv, 1309.4270 | | Services: | Forum | Review | PDF | Favorites | |
|
|
No review found.
Did you like this article?
Note: answers to reviews or questions about the article must be posted in the forum section.
Authors are not allowed to review their own article. They can use the forum section.
browser Mozilla/5.0 AppleWebKit/537.36 (KHTML, like Gecko; compatible; ClaudeBot/1.0; +claudebot@anthropic.com)
|
| |
|
|
|
|
News, job offers and information for researchers and scientists:
| |
REGISTER