C.D.S. - SIMBAD4 rel 1.7 - 2020.07.05CEST06:34:19

2007A&A...467..269G - Astronomy and Astrophysics, volume 467, 269-275 (2007/5-3)

Infrared spectroscopy of carbon monoxide in V838 Monocerotis during 2002-2006.


Abstract (from CDS):

We report spectra of the overtone and fundamental bands of CO in the eruptive variable V838 Mon, which trace the recent evolution of the star and allow its ejecta to be characterized. The data were obtained at the United Kingdom Infrared Telescope on fourteen nights from 2002 January, shortly after the first outburst of the star, to 2006 April. Although the near-infrared stellar spectrum superficially resembled a cool supergiant after both the first and third of its outbursts in 2002, its infrared ``photosphere'' at that time consisted of highly blueshifted gas that was moving outward from the original stellar surface. A spectrum obtained during the third outburst reveals a remarkable combination of emission and absorption in the CO first overtone bands. The most recent observations show a composite spectrum that includes a stellar-like photosphere at a temperature similar to that seen just after the initial outburst, but at a radial velocity redshifted by 15km/s relative to the stellar velocity determined from SiO maser emission, suggesting that the atmosphere is now contracting. Three shell components, corresponding to expansion velocities of 15, 85, and 145km/s, also are present, but absorption is seen at all expansion velocities out to 200km/s. Weak absorption features of fundamental band lines of 13CO have been detected. However, the large uncertainty in the value of 12C/13C does not constrain the evolutionary status of the progenitor.

Abstract Copyright:

Journal keyword(s): line: formation - stars: individual: V838 Monocerotis - stars: late-type - stars: mass-loss - stars: variables: general - stars: peculiar

Simbad objects: 4

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Number of rows : 4

N Identifier Otype ICRS (J2000)
ICRS (J2000)
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2020
1 NAME M31 RV No* 00 43 02.433 +41 12 56.17           M0 102 0
2 V* V838 Mon CV* 07 04 04.8222936785 -03 50 50.637499515   15.5   15.18 14.51 M10+B3V 371 0
3 V* V4334 Sgr NL* 17 52 32.69 -17 41 08.0   12.01       F2Ia 329 0
4 V* V4332 Sgr CV* 18 50 36.6959119600 -21 23 28.927014456         14.37 K8/M0e 144 0

    Equat.    Gal    SGal    Ecl

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