2011ApJ...743..118H


Query : 2011ApJ...743..118H

2011ApJ...743..118H - Astrophys. J., 743, 118 (2011/December-3)

The photometric and spectral evolution of the 2008 luminous optical transient in NGC 300.

HUMPHREYS R.M., BOND H.E., BEDIN L.R., BONANOS A.Z., DAVIDSON K., MONARD L.A.G.B., PRIETO J.L. and WALTER F.M.

Abstract (from CDS):

The 2008 optical transient in NGC 300 is one of a growing class of intermediate-luminosity transients that brighten several orders of magnitude from a previously optically obscured state. The origin of their eruptions is not understood. Our multi-wavelength photometry and spectroscopy from maximum light to more than a year later provide a record of its post-eruption behavior. We describe its changing spectral energy distribution, the evolution of its absorption- and emission-line spectrum, the development of a bipolar outflow, and the rapid transition from a dense wind to an optically thin ionized wind. In addition to strong, narrow hydrogen lines, the F-type absorption-line spectrum of the transient is characterized by strong Ca II and [Ca II] emission. The very broad wings of the Ca II triplet and the asymmetric [Ca II] emission lines are due to strong Thomson scattering in the expanding ejecta. Post-maximum, the hydrogen and Ca II lines developed double-peaked emission profiles that we attribute to a bipolar outflow. Between approximately 60 and 100 days after maximum, the F-type absorption spectrum, formed in its dense wind, weakened and the wind became transparent to ionizing radiation. We discuss the probable evolutionary state of the transient and similar objects such as SN 2008S and conclude that they were most likely post-red supergiants or post-asymptotic giant branch stars on a blue loop to warmer temperatures when the eruption occurred. These objects are not luminous blue variables.

Abstract Copyright:

Journal keyword(s): galaxies: individual: NGC 300 - galaxies: stellar content - stars: individual: NGC 300 OT2008-1 - stars: variables: general - stars: winds, outflows - supernovae: general

VizieR on-line data: <Available at CDS (J/ApJ/743/118): table6.dat>

Simbad objects: 24

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Number of rows : 24
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2022
#notes
1 M 31 G 00 42 44.330 +41 16 07.50 4.86 4.36 3.44     ~ 11842 1
2 NAME M31 RV No* 00 43 02.433 +41 12 56.17           M0 107 0
3 NAME NGC 300 OT2008-1 ev 00 54 34.16 -37 38 28.6           ~ 118 1
4 NGC 300 GiG 00 54 53.4465638304 -37 41 03.168402396 8.83 8.69 8.13 7.46   ~ 1408 2
5 NAME NGC 300 2010da s*b 00 55 04.86 -37 41 43.7           LBV 143 0
6 M 33 GiG 01 33 50.8965749232 +30 39 36.630403128 6.17 6.27 5.72     ~ 5510 1
7 NAME Magellanic Clouds GrG 03 00 -71.0           ~ 6325 1
8 SN 1987A SN* 05 35 28.020 -69 16 11.07           SNIIpec 4709 2
9 V* V838 Mon ** 07 04 04.8221494992 -03 50 50.648894412   15.5   15.18 14.51 M10+B3V 397 0
10 NGC 3180 GiG 10 18 16.985 +41 25 27.77   10.4       ~ 671 0
11 AT 2010dn ev 10 18 19.89 +41 26 28.8           ~ 20 1
12 * eta Car Em* 10 45 03.5377808928 -59 41 04.051599720 6.37 7.03 6.48 4.90 4.41 OBepec 2330 0
13 M 99 H2G 12 18 49.625 +14 24 59.36 10.45 10.44 9.87     ~ 843 2
14 M 85 GiP 12 25 24.053 +18 11 27.89   10.2       ~ 624 0
15 V* V1309 Sco No* 17 57 32.9368332984 -30 43 09.965039880   16.9   14.8   ~ 212 0
16 PSN J17592296+0617267 SN? 17 59 22.96 +06 17 26.7           ~ 6 1
17 NGC 6509 GiG 17 59 25.3151920152 +06 17 12.863588496   13.4       ~ 64 0
18 HD 168625 s*b 18 21 19.5484021368 -16 22 26.075142156 10.15 9.78 8.37 8.76   B6Iap 267 2
19 V* V4332 Sgr CV* 18 50 36.6958376520 -21 23 28.925017944         14.37 K8/M0e 158 0
20 IRC +10420 pA* 19 26 48.0979492536 +11 21 16.758531216   13.98 11.66     F8Ia+e 463 0
21 SN 2008S ev 20 34 45.33 +60 05 58.4   19.89 18.79 17.93   SNIIn? 229 1
22 NGC 6946 H2G 20 34 52.332 +60 09 13.24   10.5       ~ 2379 2
23 UGC 11973 GiG 22 16 50.4874969200 +41 30 10.030445748   13.5       ~ 45 0
24 Feige 110 HS* 23 19 58.3996844256 -05 09 56.171142864 10.360 11.45 11.50 11.970 12.145 sdO8VIIIHe5 597 1

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2022.07.05-15:13:02

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