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| Query : 2004A&A...420L...9R |
2004A&A...420L...9R - Astronomy and Astrophysics, volume 420L9-13 (2004/6-3)
WR20a: A massive cornerstone binary system comprising two extreme early-type stars.
RAUW G., DE BECKER M., NAZE Y., CROWTHER P.A., GOSSET E., SANA H., VAN DER HUCHT K.A., VREUX J.-M. and WILLIAMS P.M.
Abstract (from CDS):
We analyse spectroscopic observations of WR20a revealing that this star is a massive early-type binary system with a most probable orbital period of ∼3.675days. Our spectra indicate that both components are most likely of WN6ha or O3If*/WN6ha spectral type. The orbital solution for a period of 3.675days yields extremely large minimum masses of 70.7±4.0 and 68.8 ±3.8M☉ for the two stars. These properties make WR20a a cornerstone system for the study of massive star evolution.
Abstract Copyright: ∼
Journal keyword(s): binaries: spectroscopic - stars: early-type - stars: fundamental parameters - stars: individual: WR 20a
CDS comments: Mk 42 = Cl* NGC 2070 MEL 42.
Simbad objects: 10
| 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 - 2026 |
#notes |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1 | [HSH95] 38 | ** | 05 38 42.0996 | -69 06 07.795 | O3V+O6V | 25 | 0 | |||||
| 2 | Brey 77 | WR* | 05 38 42.1044150840 | -69 05 55.335965424 | 12.86 | 12.79 | O2If* | 90 | 0 | |||
| 3 | [HSH95] 42 | ** | 05 38 42.1802 | -69 06 02.384 | O3V+O3V | 17 | 0 | |||||
| 4 | V* V712 Car | EB* | 10 23 58.0126366512 | -57 45 48.937268268 | 15.466 | 15.473 | 13.5 | 12.6 | O3If*/WN6+O3If*/WN6 | 176 | 0 | |
| 5 | Cl Westerlund 2 | OpC | 10 23 58.1 | -57 45 49 | ~ | 400 | 0 | |||||
| 6 | GUM 29 | HII | 10 24 14.6 | -57 46 58 | ~ | 219 | 0 | |||||
| 7 | HD 92740 | WR* | 10 41 17.5158425712 | -59 40 36.895992960 | 5.68 | 6.50 | 6.42 | 7.38 | WN7h+O9III-V | 426 | 0 | |
| 8 | NGC 3603 | OpC | 11 14 57.9 | -61 14 32 | ~ | 1136 | 1 | |||||
| 9 | Cl* NGC 3603 MDS C | WR* | 11 15 07.5851367565 | -61 15 38.027795970 | 12.94 | 11.89 | WN6h | 49 | 0 | |||
| 10 | HD 214419 | WR* | 22 36 53.9548302648 | +56 54 20.989190232 | 8.68 | 9.376 | 8.996 | 8.962 | WN6o+O9Ib/II | 385 | 1 |
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