2010A&A...522A..75K


Query : 2010A&A...522A..75K

2010A&A...522A..75K - Astronomy and Astrophysics, volume 522, A75-75 (2010/11-1)

V4332 Sagittarii: a circumstellar disc obscuring the main object.

KAMINSKI T., SCHMIDT M. and TYLENDA R.

Abstract (from CDS):

V4332 Sgr experienced an outburst in 1994 whose observational characteristics in many respects resemble those of the eruption of V838 Mon in 2002. It has been proposed that these objects erupted because of a stellar-merger event. Our aim is to derive, from observational data, information on the present (10-15yrs after the outburst) nature and structure of the object. We present and analyse a high-resolution (R≃21000) spectrum of V4332 Sgr obtained with the Subaru Telescope in June 2009. Various components (stellar-like continuum, atomic emission lines, molecular bands in emission) in the spectrum are analysed and discussed. We also investigate a global spectral energy distribution (SED) of the object mostly derived from broadband optical and infrared photometry. The observed continuum resembles that of an ∼M6 giant. The emission features (atomic and molecular) are most probably produced by radiative pumping. The observed strengths of the emission features strongly suggest that we only observe a small part of the radiation of the main object responsible for pumping the emission features. An infrared component seen in the observed SED, which can be roughly approximated by two blackbodies of ∼950 and ∼200K, is ∼50 times brighter than the M6 stellar component seen in the optical. This further supports the idea that the main object is mostly obscured for us. The main object in V4332 Sgr, an ∼M6 (super)giant, is surrounded by a circumstellar disc, which is seen almost edge-on so the central star is obscured. The observed M6 spectrum probably results from scattering the central star spectrum on dust grains at the outer edge of the disc.

Abstract Copyright:

Journal keyword(s): stars: peculiar - stars: late-type - stars: individual: V4332 Sgr - circumstellar matter - line: identification

Simbad objects: 10

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Number of rows : 10
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2023
#notes
1 V* R Hor Mi* 02 53 52.7701013592 -49 53 22.730520228     3.92 4.99 1.51 M5-7e 176 0
2 V* V838 Mon No* 07 04 04.8221494992 -03 50 50.648894412       15.181 14.51 M10+B3V 404 0
3 V* VY CMa s*r 07 22 58.3261352189 -25 46 03.194390594 12.01 10.068 8.691 7.938   M5Iae 1067 0
4 IRAS 18059-3211 PN? 18 09 13.39776 -32 10 50.0340           A0III: 23 0
5 V* V4332 Sgr CV* 18 50 36.6958376520 -21 23 28.925017944         14.37 K8/M0e 162 0
6 * 58 Aql * 19 54 44.7948526968 +00 16 25.050363384   5.703 5.631     B9IV 207 0
7 V* NU Pav LP* 20 01 44.7454026 -59 22 33.217740 7.97 6.66 5.13     M6III 64 0
8 V* U Equ pA* 20 57 16.2828486240 +02 58 44.540043312           O-rich 56 0
9 * bet Gru LP? 22 42 40.05027 -46 53 04.4752 5.33 3.73 2.11 0.20 -1.57 M4.5III 197 0
10 * bet Peg LP* 23 03 46.45746 +28 04 58.0336 6.05 4.09 2.42 0.92 -0.40 M2.5II-III 585 0

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2022.12.09-17:18:04

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