2005ApJ...633L.101M

Query : 2005ApJ...633L.101M

2005ApJ...633L.101M - Astrophys. J., 633, L101-L104 (2005/November-2)

VLT observations of the ultraluminous X-ray source NGC 1313 X-2.

MUCCIARELLI P., ZAMPIERI L., FALOMO R., TUROLLA R. and TREVES A.

Abstract (from CDS):

We present archive ESO VLT photometric and spectroscopic data of the ultraluminous X-ray source NGC 1313 X-2. The superb quality of the VLT images reveals that two distinct objects, with R magnitudes 23.7 and 23.6, are visible inside the Chandra error box. The two objects, separated by 0".75, were unresolved in our previous ESO 3.6 m+EFOSC image. We show that both are stars in NGC 1313, the first a B0-O9 main-sequence star of ∼20 M☉, the second a G supergiant of ∼10 M☉. Irrespective of which of the two objects the actual counterpart is, this implies that NGC 1313 X-2 is a high-mass X-ray binary with a very massive donor.

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Journal keyword(s): Galaxies: Individual: NGC Number: NGC 1313 - stars: individual (NGC 1313 X-2) - X-Rays: Binaries - X-Rays: Galaxies

Nomenclature: Fig.1, Table 2: [ZMF2004] AN (Nos C1-C2).

Simbad objects: 8

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Number of rows : 8
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 PG 0231+051 WD* 02 33 41.3574299856 +05 18 43.649856216 14.562 15.776 16.096 16.267 16.639 DAO.6 149 0
2 NGC 1313 AG? 03 18 16.046 -66 29 53.74   10.06 10.0 9.40 10.4 ~ 723 2
3 [ZMF2004] D ? 03 18 20.96 -66 36 03.7           ~ 4 0
4 [ZMF2004] B ? 03 18 21.56 -66 36 00.9           ~ 2 0
5 [ZMF2004] A ? 03 18 21.97 -66 36 06.5           ~ 3 0
6 2E 756 ULX 03 18 22.00 -66 36 04.3   23.5 23.6     O9.5 262 3
7 [ZMF2004] C ? 03 18 22.34 -66 36 03.7           ~ 2 1
8 [ZMF2004] C2 * 03 18 22.36 -66 36 03.8     24.1     G 7 2

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