1997A&A...325L..25L

Query : 1997A&A...325L..25L

1997A&A...325L..25L - Astronomy and Astrophysics, volume 325L25-28 (1997/9-3)

The effect of rotation on the absolute visual magnitudes of OB stars measured with Hipparcos.

LAMERS H.J.G.L.M., HARZEVOORT J.M.A.G., SCHRIJVER H., HOOGERWERF R. and KUDRITZKI R.P.

Abstract (from CDS):

We derive the absolute visual magnitudes of 14 OB-stars of luminosity class III to V from the parallaxes measured by Hipparcos. The values of MV can differ by as much as 1.5mag from the MV-spectral type calibration. Slowly rotating stars, vsini<100km/s, are significantly fainter in MV than stars with vsini>100km/s of the same spectral type by about 1 magnitude. We discuss this effect and argue that it is due to the influence of rotation on the assignment of spectral types and luminosity class. Slowly rotating stars are also fainter than the standard MV-spectral type relation. This effect has important consequences on the distance determinations of stars and clusters from Mv and V.

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Journal keyword(s):

Simbad objects: 14

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Number of rows : 14
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 * o Per * 03 42 22.6459308614 +33 57 54.093701142 4.13 4.912 4.972     B0.5V 315 0
2 * ksi Per ** 03 58 57.9024302099 +35 47 27.709515737 3.190 4.080 4.060 3.88 3.89 O7.5III(n)((f)) 850 0
3 * tau Ori * 05 17 36.3903358088 -06 50 39.866785352 3.01 3.47 3.59     B6III 198 0
4 * gam Ori V* 05 25 07.86325 +06 20 58.9318 0.54 1.42 1.64 1.73 1.95 B2III 542 1
5 * phi01 Ori Y*O 05 34 49.2376273598 +09 29 22.510380606 3.29 4.26 4.41 4.42 4.59 B0.2IV 272 0
6 * lam Ori A Em* 05 35 08.2760807112 +09 56 02.991326316 2.17 3.48 3.47     O8III((f)) 527 0
7 * iot Ori SB* 05 35 25.9861932063 -05 54 35.598684624 1.45 2.53 2.77     O9IIIvar 793 0
8 * ome Ori Be* 05 39 11.1457980782 +04 07 17.288290296 3.73 4.48 4.59 4.57 4.67 B3Ve 424 1
9 * del Cir SB* 15 16 56.8959099600 -60 57 26.120078136 4.11 5.03 5.09 6.68   O8V 170 0
10 * del Sco SB* 16 00 20.00528 -22 37 18.1431 1.30 2.20 2.32 2.36 2.49 B0.3IV 776 0
11 * bet01 Sco bC* 16 05 26.2319826 -19 48 19.630018 1.68 2.55 2.62 2.60 2.69 B1V 577 0
12 * tau Sco * 16 35 52.9528530 -28 12 57.661515 1.55 2.56 2.81 2.93 3.18 B0V 959 0
13 * zet Oph Be* 16 37 09.5400587698 -10 34 01.509742704 1.73 2.58 2.56 2.46 2.50 O9.2IVnn 1908 0
14 * 10 Lac ** 22 39 15.6786372 +39 03 00.971152 3.650 4.670 4.880 4.98 5.19 O9V 790 0

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