2017A&A...597L..10K


Query : 2017A&A...597L..10K

2017A&A...597L..10K - Astronomy and Astrophysics, volume 597, L10-10 (2017/1-1)

Brightness variations of the FUor-type eruptive star V346 Normae.

KOSPAL A., ABRAHAM P., WESTHUES C. and HAAS M.

Abstract (from CDS):

Decades after the beginning of its FU Orionis-type outburst, V346 Nor unexpectedly underwent a fading event of ΔK=4.6mag around 2010. We obtained near-infrared observations and re-analyzed data from the VISTA/VVV survey to outline the brightness evolution. In our VLT/NaCO images, we discovered a halo of scattered light around V346 Nor with a size of about 0.04" (30au). The VISTA data outlined a well-defined minimum in the light curve in late 2010/early 2011, and tentatively revealed a small-amplitude periodic modulation of 58 days. Our latest data points from 2016 demonstrate that the source is still brightening but has not yet reached the 2008 level. We used a simple accretion disk model with varying accretion rate and line-of-sight extinction to reproduce the observed near-infrared magnitudes and colors. We found that the flux changes of V346 Nor before 2008 were caused by a correlated change of extinction and accretion rate, while the minimum around 2010 was mostly due to decreasing accretion. The source reached a highest accretion rate of ~=10–4M/yr in 1992. A combination of accretion and extinction changes has been invoked in the literature to interpret the flux variations of certain embedded young eruptive stars.

Abstract Copyright: © ESO, 2017

Journal keyword(s): stars: formation - circumstellar matter - infrared: stars - stars: individual: V346 Nor

Simbad objects: 13

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Number of rows : 13
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 [KOS94] HA 11 Em* 02 33 01.2 +72 43 29           K7-M0 5 0
2 V* FU Ori Or* 05 45 22.3647842544 +09 04 12.291320064   10.72 9.60     F0Iab 770 1
3 V* V1647 Ori Or* 05 46 13.1370578472 -00 06 04.885093296     18.1     ~ 260 1
4 V* V899 Mon Or* 06 09 19.2451557192 -06 41 55.882661856           ~ 21 0
5 V* V960 Mon Or* 06 59 31.5890411256 -04 05 27.765639744   16.11 14.94 13.92 12.67 ~ 36 1
6 HH 57 HH 16 32 31.96 -44 55 37.2           ~ 68 1
7 IRAS 16289-4449 Or* 16 32 32.19264 -44 55 30.6552       15.95   ~ 129 1
8 IRAS 16289-4451 IR 16 32 33.0801123096 -44 57 31.483852488           ~ 1 0
9 V* PV Cep Or* 20 45 53.9540390184 +67 57 38.679941304   19.27 17.46 15.98 14.60 A5 264 3
10 V* V2492 Cyg Or* 20 51 26.2367188536 +44 05 23.869354488   20.2   18.3   F-GII/MI 83 0
11 EM* LkHA 190 Or* 20 58 53.7335347296 +44 15 28.388727720   14.26 12.33 12.13   F7/G3I/IIe 494 0
12 SA 187- * ~ ~           ~ 6 0
13 NAME Norma I PoG ~ ~           ~ 4 0

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2022.12.07-05:34:54

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