2024RNAAS...8...75C

Query : 2024RNAAS...8...75C

2024RNAAS...8...75C - Research Notes of the AAS, 8, 75 (2024/March-0)

A Spectroscopic Hunt for Post-red Supergiants in the Large Magellanic Cloud. I. Preliminary Results.

CHEN K.M. and DORN-WALLENSTEIN T.Z.

Abstract (from CDS):

Yellow supergiants (YSGs) are rare and poorly understood, and studying them is critical to constraining massive star evolution. We obtained flux-calibrated Magellan Inamori Kyocera Echelle high-resolution spectra of 40 YSGs in the Large Magellanic Cloud (LMC); this sample likely contains post-red supergiants. Fitting these data with ATLAS9 model atmospheres, we determined fundamental parameters for these stars. We measure the first spectroscopic luminosities for YSGs above 20 M⊙, providing us a novel probe of the luminosity-to-mass ratio. Many stars in our sample appear to have anomalously high surface gravities, despite being confirmed LMC supergiants. We manually inspected our data finding evidence for binary companions and ongoing mass loss. Our work demonstrates the valuable role of high-resolution spectroscopy in interpreting the evolutionary status of cool supergiants.

Abstract Copyright: © 2024. The Author(s). Published by the American Astronomical Society.

Journal keyword(s): Massive stars - Core-collapse supernovae - Stellar pulsations - Stellar evolution - Stellar classification - High resolution spectroscopy - Binary stars - H-alpha stars - Late-type supergiant stars

Simbad objects: 41

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Number of rows : 41
N Identifier Otype ICRS (J2000)
RA 		ICRS (J2000)
DEC 		Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2026 		#notes
1 HD 268687 s*y 04 50 55.8562324872 -69 25 52.504903884 11.33 11.12 10.730 10.70 10.145 F6Ia 38 0
2 SP77 31-16 LP* 04 54 36.8435054448 -69 20 22.179167376   12.25 10.89 10.39   K/M 26 0
3 HD 268819 s*y 04 55 32.4586567536 -69 57 45.085303296 10.97 10.58 10.08 9.72 9.541 F5Ia 60 0
4 HD 268727 sg* 04 56 39.9075220656 -66 44 36.703812732   11.67 11.59     A0Ia 24 0
5 HD 268828 * 04 56 40.0088781408 -69 41 56.356809000   12.45 11.80 11.39   K5 18 0
6 RM 1-77 * 04 56 49.4338837056 -69 48 31.512451212   13.10 11.55 10.80   M: 17 0
7 HD 268865 * 04 59 43.5492169800 -68 31 22.779485148   12.17 11.46 11.05   K0 19 0
8 SV* HV 883 cC* 05 00 07.5644790720 -68 27 00.064228464 14.033 13.86 11.63 11.35 10.91 F8/G0Ia 90 0
9 HD 268971 sg* 05 01 45.1929226848 -70 35 52.163553012   11.66 11.615   11.490 A0Ia 22 0
10 HD 268949 sg* 05 03 13.6191878568 -68 33 35.382097584   11.83 11.76     A0Ia 24 0
11 HD 268946 sg* 05 05 12.2203060992 -66 44 12.572004624 9.86 10.41 10.42 10.28 10.17 A0Ia 54 0
12 HD 33579 sg* 05 05 55.5114721104 -67 53 10.932988848   9.32 9.13     A2Ia+ 148 0
13 HD 269070 * 05 05 58.1248247712 -70 32 05.621844336   11.70 11.061   10.147 K5 16 1
14 HD 269110 LP* 05 09 10.6083407328 -69 36 12.203504280 12.51 11.76 10.82     G0I: 38 0
15 HD 269331 s?y 05 18 01.8324453648 -69 33 37.767513132   10.56 10.31 9.72 9.869 A5Ia0 37 0
16 SK -69 99 * 05 18 30.1694226624 -69 13 14.054852460   11.76 11.94     A0I 14 0
17 SV* HV 2450 LP* 05 19 53.2668825000 -68 04 03.693824616   14.38   9.28   M1 26 0
18 SP77 48-6 LP* 05 21 46.9782726720 -71 19 43.909297248   13.4 12.0     M 16 0
19 NAME LMC G 05 23 34.6 -69 45 22     0.4     ~ 19090 0
20 CD-69 310 * 05 27 51.2040062256 -69 00 55.364646168 11.13 10.96 10.70     F2I 26 0
21 SK -69 148 s*y 05 28 27.9201154224 -69 12 57.413507868 14.093 12.54 10.93 10.23   G2Ia 26 0
22 HD 269604 sg* 05 28 31.3672496208 -68 53 55.749735564   10.87 10.74     A1Ia0 44 0
23 [W60] D17 s*r 05 30 02.2715021712 -67 02 45.077639712 14.883 13.05 11.29 9.21   K5I 23 0
24 HD 269651 * 05 30 32.4335586624 -69 09 11.891129364   10.92 10.73     F0I 31 0
25 HD 269661 sg* 05 30 50.0811353208 -69 31 29.399422332 9.95 10.47 10.34 10.16 10.03 A0Ia0e: 61 0
26 HD 269662 sg* 05 30 51.4749432240 -69 02 58.590657600 10.23 10.52 10.28 10.40 10.390 A0Ia 113 0
27 HD 269697 s*y 05 31 38.4223359696 -67 28 11.562011760 10.99 10.69 10.28     F6Ia 64 0
28 HD 269723 s*y 05 32 24.9642601152 -67 41 53.614053924   10.98 9.91     G4_0 62 0
29 HD 269762 sg* 05 34 09.9708489168 -68 59 12.649096680   11.45 11.37     A2Ia 28 0
30 HD 269781 sg* 05 34 22.4676706872 -67 01 23.569790196 9.34 9.94 9.87 9.74 9.67 A0Iae 64 0
31 HD 269787 sg* 05 34 34.3613333256 -66 58 23.423003256 10.58 10.99 10.73 10.73 10.71 A0Ia0 38 0
32 2MASS J05344326-6704104 * 05 34 43.2717587808 -67 04 10.462787184   13.65 11.92 11.11   ~ 9 0
33 HD 269807 sg* 05 35 00.2460003408 -67 01 12.688899816 11.13 11.01 10.85 10.89 10.662 A5Ia 35 0
34 HD 269840 s*y 05 36 10.0810875264 -68 55 41.264091912   10.74 10.334   9.774 F3Ia 45 0
35 HD 269857 sg* 05 36 32.3788464672 -68 54 01.671345252   10.64 10.29     A9Ia 50 0
36 HD 269879 s*y 05 36 47.1963137928 -66 45 46.005992280 12.87 12.02 10.94     G2Ia 39 0
37 HD 269902 sg* 05 38 09.5829719016 -69 06 21.316154364   10.59 10.23     A1Ia+ 45 0
38 HD 269953 s*y 05 40 12.1666201344 -69 40 04.853223012   10.83 9.95     G0_0 94 0
39 HD 269982 sg* 05 40 57.8100594504 -69 15 31.143653028   11.15 10.79     A3Ia 44 0
40 CPD-69 496 s*y 05 40 59.1411489120 -69 20 35.438465400   11.94 11.30     F6Ia 28 0
41 HD 270050 s*y 05 42 29.1686592048 -67 19 41.961744048   11.24 10.84     F6Ia 38 0

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