2004ApJ...600..182B

Query : 2004ApJ...600..182B

2004ApJ...600..182B - Astrophys. J., 600, 182-187 (2004/January-1)

On the photometric variability of blue supergiants in NGC 300 and its impact on the flux-weighted gravity-luminosity relationship.

BRESOLIN F., PIETRZYNSKI G., GIEREN W., KUDRITZKI R.-P., PRZYBILLA N. and FOUQUE P.

Abstract (from CDS):

We present a study of the photometric variability of spectroscopically confirmed supergiants in NGC 300, comprising 28 epochs extending over a period of 5 months. We find 15 clearly photometrically variable blue supergiants in a sample of nearly 70 such stars, showing maximum light amplitudes ranging from 0.08 to 0.23 mag in the V band, and one variable red supergiant. We show their light curves and determine semiperiods for two A2 Ia stars. Assuming that the observed changes correspond to similar variations in bolometric luminosity, we test for the influence of this variability on the flux-weighted gravity-luminosity relationship and find a negligible effect, showing that the calibration of this relationship, which has the potential to measure extragalactic distances at the Cepheid accuracy level, is not affected by stellar photometric variability in any significant way.

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Journal keyword(s): Galaxies: Individual: NGC Number: NGC 300 - Galaxies: Stellar Content - Stars: Early-Type - Stars: Variables: Other - Stars: Supergiants

Simbad objects: 31

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Number of rows : 31
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 M 31 AGN 00 42 44.330 +41 16 07.50 4.86 4.36 3.44     ~ 13622 1
2 [BGK2002] C12 * 00 54 18.050 -37 36 09.71   20.18 20.16     B9.5 4 0
3 [BGK2002] C16 V* 00 54 21.938 -37 38 12.77   18.09 18.04     B9 3 0
4 [BGK2002] C17 V* 00 54 22.528 -37 38 25.50   21.10 20.97     ~ 3 0
5 [BGK2002] C8 * 00 54 23.455 -37 35 07.01   20.00 20.05     B9 4 0
6 [BGK2002] D13 * 00 54 26.105 -37 43 56.84   19.01 18.98     A0 4 0
7 [BGK2002] C5 V* 00 54 31.834 -37 34 32.86   20.55 20.66     B2 3 0
8 [BGK2002] D12 V* 00 54 32.423 -37 43 37.46   18.82 18.65     A2 7 0
9 [BGK2002] D17 * 00 54 32.693 -37 45 21.46   19.56 19.54     B9.5 4 0
10 [BGK2002] C6 sg* 00 54 33.190 -37 34 55.72   19.96 19.91     A0Ia 5 0
11 [BGK2002] C3 V* 00 54 36.242 -37 33 51.58   19.91 19.88     B8.5 2 0
12 [BGK2002] C7 * 00 54 39.558 -37 35 39.28   20.35 20.35     A0 2 0
13 [BGK2002] B16 V* 00 54 44.645 -37 42 39.13   18.91 19.02     WN11 6 0
14 [BGK2002] B10 V* 00 54 47.072 -37 40 25.63   19.50 19.45     A2.5 4 0
15 [BGK2002] B11 V* 00 54 47.310 -37 40 42.28   19.95 19.95     A5 5 0
16 [BGK2002] B7 V* 00 54 51.950 -37 39 23.85   20.41 20.45     B2 3 0
17 NGC 300 GiG 00 54 53.4465638304 -37 41 03.168402396 8.83 8.69 8.13 7.46   ~ 1614 2
18 [BGK2002] B12 V* 00 54 56.083 -37 41 04.02   19.12 19.30     B0.5 5 0
19 [BGK2002] B13 V* 00 54 56.754 -37 41 33.79   18.53 18.64     B3 4 0
20 [BGK2002] B14 V* 00 55 01.465 -37 41 46.80   19.90 19.86     A0 3 0
21 [BGK2002] B17 V* 00 55 04.077 -37 42 53.99   19.27 19.37     B0.5 3 0
22 [BGK2002] A10 V* 00 55 31.961 -37 41 38.33   19.05 18.98     A2 8 0
23 [BGK2002] A5 V* 00 55 32.1159133344 -37 39 39.839412996   22.89 20.71     ~ 2 0
24 [BGK2002] A13 * 00 55 33.276 -37 42 46.78   19.77 19.83     B8 3 0
25 [BGK2002] A18 * 00 55 34.875 -37 44 48.15   19.96 19.99     B8 3 0
26 [BGK2002] A11 V* 00 55 38.317 -37 41 56.81   18.48 18.41     B8 4 0
27 [BGK2002] A8 * 00 55 41.619 -37 40 58.61   19.43 19.44     B9.5 5 0
28 M 33 GiG 01 33 50.8965749232 +30 39 36.630403128 6.17 6.27 5.72     ~ 6226 1
29 NGC 3621 Sy2 11 18 16.300 -32 48 45.36 10.10 9.44 9.56 8.07 10.1 ~ 661 3
30 NGC 6822 G 19 44 56.199 -14 47 51.29   18 8.1     ~ 1661 0
31 NAME Local Group GrG ~ ~           ~ 9325 0

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