2009A&A...507.1555C


C.D.S. - SIMBAD4 rel 1.7 - 2021.02.27CET13:59:16

2009A&A...507.1555C - Astronomy and Astrophysics, volume 507, 1555-1565 (2009/12-1)

Bolometric luminosity variations in the luminous blue variable AFGL2298.

CLARK J.S., CROWTHER P.A., LARIONOV V.M., STEELE I.A., RITCHIE B.W. and ARKHAROV A.A.

Abstract (from CDS):

We characterise the variability in the physical properties of the luminous blue variable AFGL 2298 (IRAS 18576+0341) between 1989-2008. In conjunction with published data from 1989-2001, we have undertaken a long term (2001-2008) near-IR spectroscopic and photometric observational campaign for this star and utilise a non-LTE model atmosphere code to interpret these data. We find AFGL 2298 to have been highly variable during the two decades covered by the observational datasets. Photometric variations of ≥1.6mag have been observed in the JHK wavebands; however, these are not accompanied by correlated changes in near-IR colour. Non-LTE model atmosphere analysis of 4 epochs of K band spectroscopy obtained between 2001-7 suggests that the photometric changes of AFGL 2298 were driven by expansion and contraction of the stellar photosphere accompanied by comparatively small changes in the stellar temperature (ΔT*∼4.5kK). Unclumped mass loss rates throughout this period were modest and directly comparable to those of other highly luminous (candidate) LBVs. However, the main finding of this analysis was that the bolometric luminosity of AFGL 2298 appears to have varied by at least a factor of ∼2 between 1989-2008, with it being one of the most luminous stars in the Galaxy during maximum. Comparison to other LBVs that have undergone non bolometric luminosity conserving ``eruptions'' shows such events to be heterogeneous, with AFGL 2298 the least extreme example. These results - and the diverse nature of both the quiescent LBVs and associated ejecta - may offer support to the suggestion that more than one physical mechanism is responsible for such behaviour.

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Journal keyword(s): stars: evolution - stars: early-type - stars: supergiants - stars: individual: AFGL 2298

Simbad objects: 44

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Number of rows : 44

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2021
#notes
1 NAME SMC G 00 52 38.0 -72 48 01   2.79 2.2     ~ 9697 1
2 NAME NGC 300 OT2008-1 ev 00 54 34.16 -37 38 28.6           ~ 110 1
3 HD 5980 WR* 00 59 26.5847969465 -72 09 53.927725716   11.13 11.31   11.029 WN4+O7I: 363 1
4 SN 1961V SN* 02 43 36.42 +37 20 43.6   12.7 12.5     SNIIpec? 199 2
5 SN 2006gy SN* 03 17 27.06 +41 24 19.5       14.20   SNIIn 297 1
6 V* S Dor sg* 05 18 14.3572490675 -69 15 01.148131817 9.08 10.39 10.25 9.74 9.14 A5Iaeq 352 0
7 NGC 2363 G 07 28 29.83 +69 11 32.8   15.5       ~ 251 1
8 NGC 2363A HII 07 28 42.8 +69 11 21           ~ 543 3
9 [DRR96] NGC 2363 V1 V* 07 28 43.37 +69 11 23.9   17.82 17.88     ~ 34 1
10 NGC 2366 H2G 07 28 51.85 +69 12 31.1 12.25 11.86 11.39 11.33   ~ 711 0
11 SN 1954J SN* 07 36 56.20 +65 37 52.3   16.3 16.50     SNIIpec? 90 2
12 TS V37 s*b 07 37 01.83 +65 34 29.3     19     LBV 60 1
13 WR 19 WR* 10 18 04.9886804992 -58 16 26.241795620   14.80 13.85     WC5+O9 57 0
14 HD 90177 s*b 10 22 53.8426931454 -59 37 28.361118869 9.16 9.66 8 8.15   LBV 308 0
15 NAME Little Homunculus ISM 10 45 -59.7           ~ 60 2
16 * eta Car Em* 10 45 03.5455050 -59 41 03.951060 6.37 7.034 6.21 4.90 4.41 OBepec 2254 0
17 SN 2000ch SN* 10 52 41.40 +36 40 09.5     17.4     SNIIn? 85 2
18 V* AG Car WR* 10 56 11.5779283438 -60 27 12.809532379 7.00 7.57 6.96 7.73   WN11h 598 0
19 MR 35 s*b 11 08 40.0633818066 -60 42 51.718989987   12.33 10.20 11.66   LBV 118 0
20 SN 1997bs ev 11 20 14.25 +12 58 19.6     17.13     SNIIn? 112 1
21 SN 2006tf SN* 12 46 15.81 +11 25 55.4     16.7     SNIIn 94 1
22 RAFGL 1822 OH* 16 06 08.363 -30 49 33.99           ~ 51 0
23 Cl Westerlund 1 OpC 16 47 04.00 -45 51 04.9           ~ 485 0
24 Cl* Westerlund 1 W 243 s*b 16 47 07.5028508821 -45 52 29.152464693   19.873 15.730     LBV 53 0
25 HD 326823 WR* 17 06 53.9048235954 -42 36 39.705015741 9.68 9.87 9.03 9.51   WNpec 73 1
26 NAME Gal Center reg 17 45 40.04 -29 00 28.1           ~ 11996 0
27 NAME Quintuplet Cluster OpC 17 46 13.9 -28 49 48           ~ 462 0
28 [FMM95] 3 s*b 17 46 15.240 -28 50 03.58           LBV 142 1
29 [GMC99] D6 s*b 17 46 17.982 -28 49 03.46           LBV 58 0
30 WR 102ka WR* 17 46 18.12 -29 01 36.6           WN10 29 0
31 HD 316285 s*b 17 48 14.0369781568 -28 00 53.124817157 11.88 11.27 9.60 9.28   B0Ieq 181 2
32 PSR J1808-2024 Psr 18 08 39.32 -20 24 40.1           ~ 1133 2
33 HD 168625 s*b 18 21 19.5486475779 -16 22 26.077308888 10.15 9.78 8.37 8.76   B6Iap 255 2
34 V* V481 Sct s*b 18 33 55.2778598542 -06 58 38.634278867           LBV_B[e]: 45 0
35 MSX6C G026.4700+00.0207 s*b 18 39 32.2479397055 -05 44 20.194778342           LBV_B 37 1
36 IRAS 18576+0341 s*b 19 00 10.89456 +03 45 47.1096           B8I 83 1
37 HD 179821 pA* 19 13 58.6083165753 +00 07 31.934676028 10.81 9.694 8.19     G4_0-Ia 226 0
38 [KW97] 37-17 LP* 19 23 47.6416797701 +14 36 39.064626755     15.1     O4I 19 0
39 IRC +10420 pA* 19 26 48.0981288433 +11 21 16.756524951   13.98 11.66     F8Ia+e 456 0
40 HD 192641 WR* 20 14 31.7667382048 +36 39 39.597237795 7.80 8.20 7.91     WC7pd+O9V 313 0
41 * P Cyg s*b 20 17 47.2020844 +38 01 58.552724 4.66 5.24 4.82 4.28 4.02 B1-2Ia-0ep 1140 1
42 IRAS 20298+4011 Em* 20 31 42.2841507943 +40 21 59.061205285     15.1     B:I[e] 87 0
43 SN 2008S ev 20 34 45.33 +60 05 58.4   19.89 18.79 17.93   SNIIn? 215 1
44 * rho Cas LP* 23 54 23.0339951270 +57 29 57.766930774 7.00 5.85 4.59 3.63 2.89 G2_0 365 0

    Equat.    Gal    SGal    Ecl

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2021.02.27-13:59:16

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