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S1040 in M67: A Post-Mass-Transfer Binary with a Helium-Core White Dwarf | | W. Landsman
; J. Aparicio
; P. Bergeron
; R. Di Stefano
; T. Stecher
; | | Date: |
10 Mar 1997 | | Subject: | astro-ph | | Affiliation: | Hughes STX), J. Aparicio (U. de Montreal), P. Bergeron (Lockheed Martin Canada), R. Di Stefano (Harvard/CFA), T. Stecher (NASA/GSFC | | Abstract: | We have obtained spectra of the yellow giant S1040 in the open cluster M67 using the Goddard High-Resolution Spectrograph (GHRS) and the Faint Object Spectrograph on the Hubble Space Telescope. S1040 is a single-lined spectroscopic binary with a 42.8d period that occupies a "red straggler" position in the M67 color-magnitude diagram (CMD), 0.2 mag blueward of the giant branch. A detection of S1040 at 1620 A with the Ultraviolet Imaging Telescope provided evidence that the secondary is a hot white dwarf, and thus that the anomalous location of S1040 in the CMD is likely due to a prior episode of mass-transfer. Our GHRS spectrum shows a broad Ly alpha absorption profile that confirms the white dwarf identification of the S1040 secondary. A model atmosphere fit to the GHRS spectrum yields Teff = 16,160 K, log g = 6.7, and a mass of 0.22 Msun, for an assumed cluster distance of 820 pc and reddening of E(B-V) = 0.02. The unusually low mass derived for the white dwarf implies that it must have a helium core, and that a mass-transfer episode must have begun while the progenitor was on the lower giant branch. We construct a plausible mass-transfer history for S1040 in which it originated as a short (~2d) period binary, and evolved through a blue straggler phase to reach its current state. | | Source: | arXiv, astro-ph/9703053 | | Services: | Forum | Review | PDF | Favorites | |
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