|
| | | | |
| | | |
| Stat |
Members: 3645
Articles: 2'506'133
Articles rated: 2609
26 April 2024 |
|
| | | | |
|
Article overview
| |
|
|
A high-velocity bulge RR Lyrae variable on a halo-like orbit | | Andrea Kunder
; R. Michael Rich
; Keith Hawkins
; Radek Poleski
; Jesper Storm
; Christian I. Johnson
; Juntai Shen
; Zhao-Yu Li
; Maria Jose Cordero
; David M. Nataf
; Giuseppe Bono
; Alistair R. Walker
; Andreas Koch
; Roberto De Propris
; Andrzej Udalski
; Michal K. Szymanski
; Igor Soszynski
; Grzegorz Pietrzynski
; Krzysztof Ulaczyk
; Lukasz Wyrzykowski
; Pawel Pietrukowicz
; Jan Skowron
; Szymon Kozlowski
; Przemyslaw Mroz
; | | Date: |
8 Jun 2015 | | Abstract: | We report on the RR Lyrae variable star, MACHO 176.18833.411, located toward
the Galactic bulge and observed within the data from the ongoing Bulge RR Lyrae
Radial Velocity Assay (BRAVA-RR), which has the unusual radial velocity of -372
+- 8 km/s and true space velocity of -482 +- 22 km/s relative to the Galactic
rest frame. Located less than 1 kpc from the Galactic center and toward a field
at (l,b)=(3,-2.5), this pulsating star has properties suggesting it belongs to
the bulge RR Lyrae star population yet a velocity indicating it is abnormal, at
least with respect to bulge giants and red clump stars. We show that this star
is most likely a halo interloper and therefore suggest that halo contamination
is not insignificant when studying metal-poor stars found within the bulge
area, even for stars within 1 kpc of the Galactic center. We discuss the
possibility that MACHO 176.18833.411 is on the extreme edge of the bulge RR
Lyrae radial velocity distribution, and also consider a more exotic scenario in
which it is a runaway star moving through the Galaxy. | | Source: | arXiv, 1506.2664 | | 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