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Asymptotic giant branch stars in the Leo I dwarf spheroidal galaxy
| Content Provider | Paperity |
|---|---|
| Author | Menzies, John W. Feast, Michael W. Whitelock, Patricia A. Matsunaga, Noriyuki |
| Abstract | 26 asymptotic giant branch (AGB) variables are identified in the Local Group galaxy Leo I. These include seven Mira and five semiregular variables for which periods, amplitudes and mean magnitudes are determined. The large range of periods for the Miras, 158 < P < 523 d, suggests an AGB spanning a significant age range. The youngest must be around 1.6 Gyr while the oldest could be 10 Gyr or more. Two of these old Miras are found in the outer regions of Leo I (over 490 arcsec from the centre) where stars on the extended AGB are rare. They could provide an interesting test of third dredge-up and mass-loss in old stars with low metallicity, and are worth further detailed investigation. At least two stars, one a Mira and the other an irregular variable, are undergoing obscuration events due to dust ejection. An application of the Mira period–luminosity relation to these stars yields a distance modulus for Leo I of (m−M)0= 21.80 ± 0.11 mag (internal), ± 0.12 (total) (on a scale that puts the Large Magellanic Cloud at 18.39 mag) in good agreement with other determinations. |
| Starting Page | 86 |
| Ending Page | 94 |
| File Format | HTM / HTML |
| ISSN | 00358711 |
| DOI | 10.1111/j.1365-2966.2010.16670.x |
| Issue Number | 1 |
| Journal | Monthly Notices of the Royal Astronomical Society |
| Volume Number | 406 |
| e-ISSN | 13652966 |
| Language | English |
| Publisher | Oxford University Press |
| Publisher Date | 2010-07-21 |
| Access Restriction | Open |
| Subject Keyword | Stars: agb and post-agb Galaxies: stellar content Local group Galaxies: individual: leo i Stars: variables: general Galaxies: dwarf |
| Content Type | Text |
| Resource Type | Article |
| Subject | Astronomy and Astrophysics Space and Planetary Science |
