2009ApJ...703..300G


Query : 2009ApJ...703..300G

2009ApJ...703..300G - Astrophys. J., 703, 300-310 (2009/September-3)

The NGC 300 transient: an alternative method for measuring progenitor masses.

GOGARTEN S.M., DALCANTON J.J., MURPHY J.W., WILLIAMS B.F., GILBERT K. and DOLPHIN A.

Abstract (from CDS):

We present an alternative technique for measuring the precursor masses of transient events in stars undergoing late stage stellar evolution. We use the well-established techniques of stellar population modeling to age-date the stars surrounding the site of the recent transient event in NGC 300 (NGC 300 OT2008-1). The surrounding stars must share a common turnoff mass with the transient, since almost all stars form in stellar clusters that remain physically associated for periods longer than the lifetime of the most massive stars. We find that the precursor of NGC 300 OT2008-1 is surrounded by stars that formed in a single burst between 8 and 13 Myr ago, with 70% confidence. The transient was therefore likely to be due to a progenitor whose mass falls between the main sequence turnoff mass (12-17 M) and the maximum stellar mass (16-25 M) found for isochrones bounding this age range. We characterize the general applicability of this technique in identifying precursor masses of historic and future transients and supernovae (SNe), noting that it requires neither precursor imaging nor sub-arcsecond accuracy in the position of the transient. It is also based on the well-understood physics of the main sequence, and thus may be a more reliable source of precursor masses than fitting evolutionary tracks to precursor magnitudes. We speculate that if the progenitor mass is ≳17 M, there may be a connection between optical transients such as NGC 300 OT2008-1 and the missing type II-P SNe, known as the "red supergiant problem."

Abstract Copyright:

Journal keyword(s): galaxies: individual: NGC 300 - galaxies: stellar content - stars: evolution

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 - 2022
#notes
1 NAME NGC 300 OT2008-1 ev 00 54 34.16 -37 38 28.6           ~ 118 1
2 NGC 300 GiG 00 54 53.4465638304 -37 41 03.168402396 8.83 8.69 8.13 7.46   ~ 1408 2
3 SN 2007gr SN* 02 43 27.98 +37 20 44.7       12.77   SNIc 209 1
4 NAME Magellanic Clouds GrG 03 00 -71.0           ~ 6319 1
5 SN 1987A SN* 05 35 28.020 -69 16 11.07           SNIIpec 4708 2
6 2MASS J07371703+6535579 HXB 07 37 17.0432126424 +65 35 57.826001220           SNIIP 252 1
7 M 81 Sy2 09 55 33.1726556496 +69 03 55.062505368   7.89 6.94     ~ 4185 3
8 NAME M85 OT2006-1 No* 12 25 23.82 +18 10 56.2     19.30     ~ 62 1
9 SN 2008S ev 20 34 45.33 +60 05 58.4   19.89 18.79 17.93   SNIIn? 229 1
10 NGC 6946 H2G 20 34 52.332 +60 09 13.24   10.5       ~ 2379 2

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2022.07.03-19:24:01

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