Astron. J., 149, 17 (2015/January-0)
The continued optical to mid-infrared evolution of V838 Monocerotis.
LOEBMAN S.R., WISNIEWSKI J.P., SCHMIDT S.J., KOWALSKI A.F., BARRY R.K., BJORKMAN K.S., HAMMEL H.B., HAWLEY S.L., HEBB L., KASLIWAL M.M., LYNCH D.K., RUSSELL R.W., SITKO M.L. and SZKODY P.
Abstract (from CDS):
The eruptive variable V838 Monocerotis (V838 Mon) gained notoriety in 2002 when it brightened nine magnitudes in a series of three outbursts and then rapidly evolved into an extremely cool supergiant. We present optical, near-infrared (near-IR), and mid-IR spectroscopic and photometric observations of V838 Mon obtained between 2008 and 2012 at the Apache Point Observatory 3.5 m, NASA IRTF 3 m, and Gemini South 8 m telescopes. We contemporaneously analyze the optical and IR spectroscopic properties of V838 Mon to arrive at a revised spectral type L3 supergiant and effective temperature Teff ∼ -2200 K. Because there are no existing optical observational data for L supergiants, we speculate that V838 Mon may represent the prototype for L supergiants in this wavelength regime. We find a low level of Hα emission present in the system, consistent with interaction between V838 Mon and its B3V binary; however, we cannot rule out a stellar collision as the genesis event, which could result in the observed Hα activity. Based upon a two-component blackbody fit to all wavelengths of our data, we conclude that, as of 2009, a shell of ejecta surrounded V838 Mon at a radius of R = 263 ± 10 AU with a temperature of T = 285 ± 2K. This result is consistent with IR interferometric observations from the same era and predictions from the Lynch et al. model of the expanding system, which provides a simple framework for understanding this complicated system.
circumstellar matter - stars: general - stars: individual: V838 Monocerotis - stars: peculiar - stars: variables: general - stars: winds, outflows
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