2002A&A...389L..51M


C.D.S. - SIMBAD4 rel 1.7 - 2020.07.04CEST21:28:42

2002A&A...389L..51M - Astronomy and Astrophysics, volume 389, L51-56 (2002/7-2)

The mysterious eruption of V838 Mon.

MUNARI U., HENDEN A., KIYOTA S., LANEY D., MARANG F., ZWITTER T., CORRADI R.L.M., DESIDERA S., MARRESE P.M., GIRO E., BOSCHI F. and SCHWARTZ M.B.

Abstract (from CDS):

V838 Mon is marking one of the most mysterious stellar outbursts on record. The spectral energy distribution of the progenitor resembles an under-luminous F main sequence star (at V=15.6mag), that erupted into a cool supergiant following a complex and multi-maxima lightcurve (peaking at V=6.7mag). The outburst spectrum show BaII, LiI and lines of several s-elements, with wide P-Cyg profiles and a moderate and retracing emission in the Balmer lines. A light-echo discovered expanding around the object helped to constrain the distance (d=790±30pc), providing MV=+4.45 in quiescence and MV=-4.35 at optical maximum (somewhat dependent on the still uncertain EB–V=0.5 reddening). The general outburst trend is toward lower temperatures and larger luminosities, and continuing so at the time of writing. The object properties conflict with a classification within already existing categories: the progenitor was not on a post-AGB track and thus the similarities with the born-again AGB stars FG Sge, V605 Aql and Sakurai's object are limited to the cool giant spectrum at maximum; the cool spectrum, the moderate wind velocity (500km/s and progressively reducing) and the monotonic decreasing of the low ionization condition argues against a classical nova scenario. The closest similarity is with a star that erupted into an M-type supergiant discovered in M 31 by Rich et al. (1989ApJ...341L..51R), that became however much brighter by peaking at MV=-9.95, and with V4332 Sgr that too erupted into an M-type giant (Martini et al., 1999AJ....118.1034M) and that attained a lower luminosity, closer to that of V838 Mon. M 31-RedVar, V4332 Sgr and V838 Mon could be all manifestations of a new class of astronomical objects.

Abstract Copyright:

Journal keyword(s): stars: supergiants - stars: novae - stars: individual: V838 Mon - stars: mass-loss - ISM: jets and outflows

Simbad objects: 7

goto Full paper

goto View the reference in ADS

Number of rows : 7

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2020
#notes
1 M 31 G 00 42 44.330 +41 16 07.50 4.86 4.36 3.44     ~ 10902 1
2 NAME M31 RV No* 00 43 02.433 +41 12 56.17           M0 102 0
3 V* V838 Mon CV* 07 04 04.8222936785 -03 50 50.637499515   15.5   15.18 14.51 M10+B3V 371 0
4 V* V4334 Sgr NL* 17 52 32.69 -17 41 08.0   12.01       F2Ia 329 0
5 V* V4332 Sgr CV* 18 50 36.6959119600 -21 23 28.927014456         14.37 K8/M0e 144 0
6 PN A66 58 PN 19 18 20.476 +01 46 59.62           [WC4] 287 0
7 Hen 1-5 pA* 20 11 56.06832 +20 20 04.4916 11.41 10.66 9.45     G8/K0Iae 488 1

    Equat.    Gal    SGal    Ecl

To bookmark this query, right click on this link: simbad:objects in 2002A&A...389L..51M and select 'bookmark this link' or equivalent in the popup menu


2020.07.04-21:28:42

© Université de Strasbourg/CNRS

    • Contact