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The MACHO Project LMC Variable Star Inventory: Classical Cepheids and AGB Variables | | D.Alves
; C.Alcock
; K.Cook
; S.Marshall
; D.Minniti
; R.Allsman
; T.Axelrod
; K.Freeman
; B.Peterson
; A.Rodgers
; K.Griest
; T.Vandehei
; A.Becker
; C.Stubbs
; A.Tomaney
; D.Bennett
; M.Lehner
; P.Quinn
; M.Pratt
; W.Sutherland
; D.Welch
; | | Date: |
1 Apr 1998 | | Subject: | astro-ph | | Affiliation: | LLNL), R.Allsman, T.Axelrod, K.Freeman, B.Peterson, A.Rodgers (MSSSO), K.Griest, T.Vandehei (UCSD), A.Becker, C.Stubbs, A.Tomaney (UW), D.Bennett (ND), M.Lehner (Shef), P.Quinn (ESO), M.Pratt (MIT), W.Sutherland (Ox), D.Welch (McMaster | | Abstract: | The MACHO Project’s time-sampled photometric database contains thousands of LMC variable star lightcurves. We briefly review the Cepheid catalog. A third sequence is identified in the period-luminosity diagram, lying parallel to and fainter than the 1H and F mode sequences. These are excellent candidates to be Cepheids crossing the instability strip for the first time. However, we find no evidence for period-changes in the four-year MACHO lightcurves of these Cepheids. Anticipating the MACHO four-year LMC variable star catalog, we undertake a preliminary reconnaissance of the 18,500 year-one "red variables". The vast majority are newly discovered low-amplitude variable stars, and may be on the AGB. We present the dual peaked differential luminosity function, period-frequency histograms, and the period-luminosity diagram. New AGB variables in the LMC clusters NGC 1783 and NGC 1898 are identified. We make a comparison with AGB variables in 47 Tuc and theoretical data; implications for the Mira PL relation are discussed. Lastly, we present the lightcurve of a carbon-rich AGB variable found near the LMC cluster NGC 2056 whose episodic fading is consistent with discrete mass-loss events. | | Source: | arXiv, astro-ph/9804003 | | Services: | Forum | Review | PDF | Favorites | |
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