期刊
ASTROPHYSICAL JOURNAL LETTERS
卷 748, 期 1, 页码 -出版社
IOP PUBLISHING LTD
DOI: 10.1088/2041-8205/748/1/L5
关键词
stars: formation; stars: individual (V900 Mon); stars: low-mass; stars: pre-main sequence; stars: protostars
资金
- NASA Astrobiology Institute [NNA04CC08A]
- NSF [AST-07-02941]
Detailed observations of a recently recognized eruptive variable, V900 Mon, are presented. The star is located in the small cloud L1656, a little-studied region of modest star formation activity in Monoceros, and is presently at a magnitude of r similar to 16, surrounded by a bright compact reflection nebula, where only a 20th magnitude star was seen on the red first-epoch POSS plate. Optical spectra show a red absorption-line spectrum not later than mid-K, and the H alpha line and the Na I D-12 doublet display prominent P Cygni profiles with massive absorption troughs indicating a cool outflowing wind. Near-infrared spectra show deep CO bandhead absorption and pronounced molecular bands of water vapor indicative of a much cooler object. This spectral appearance is very similar to that of FU Orionis, except that V900 Mon has a much higher reddening of A(V) similar to 13 mag. The energy distribution of V900 Mon, compiled from non-simultaneous observations and thus dependent on possible luminosity changes, shows that V900 Mon is a Class I protostar with a massive cool envelope. At a distance of about 1100 pc, V900 Mon has a luminosity of 106 L-circle dot in the range of 0.55-160 mu m. These data identify V900 Mon as a new member of the rare class of FU Orionis variables.
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