2002A&A...387..108P


Query : 2002A&A...387..108P

2002A&A...387..108P - Astronomy and Astrophysics, volume 387, 108-116 (2002/5-3)

A revision of the fundamental parameters of the open cluster Hogg 15 and the projected star WR 47.

PIATTI A.E., BICA E., SANTOS J.F.C.Jr and CLARIA J.J.

Abstract (from CDS):

We revise the fundamental parameters of the faint open cluster Hogg 15, for which two recent colour-magnitude diagram (CMD) studies have obtained significantly different ages. In the present study, we combine a series of methods trying to constrain age, together with other fundamental parameters. We employ spatial extractions to construct the CMDs, and the cluster integrated spectrum to compare it with those of templates of known age. We derive fundamental parameters, in particular, distance, of the closely projected Wolf-Rayet star HDE 311884 (WR 47) - often proposed to be physically related to Hogg15. Based on the WR 47 spectrum and available photometry, we conclude that the short distance implied by the Hipparcos parallax (216pc) is affected by binary motion. From the WR 47 spectrum we estimate a reddening E(B-V) and a distance of 1.10±0.05 and 5.2±0.9kpc, respectively. For Hogg 15 we derive an age of 20±10Myr, a reddening of 1.10±0.05, and a distance of 3.1±0.5kpc. We conclude that Hogg 15 is not related to WR 47 from the point of view of origin, since the cluster and the star do not belong to the same formation event.

Abstract Copyright:

Journal keyword(s): techniques: photometric - techniques: spectroscopic - galaxy: open clusters and associations: general - galaxy: open clusters and associations: individual: Hogg 15 - stars: individual: WR 47

Simbad objects: 12

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Number of rows : 12
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2022
#notes
1 WR 35 WR* 11 00 21.8549644416 -61 13 52.417245540   14.460 13.574 13.453   WN6h-w 32 0
2 Cl Hogg 15 OpC 12 43 37 -63 06.1   11.21 10.3     ~ 50 0
3 HD 311884 WR* 12 43 50.9991209208 -63 05 14.812489320 11.45 11.64 10.81 10.59   WN6+O5V 164 0
4 MR 53 WR* 14 13 03.5252119752 -65 26 52.707986592 11.93 12.51 12.32 12.21   WN5-w 70 0
5 WRAY 15-1254 WR* 14 50 58.2650618251 -59 51 26.428849251 14.29 13.96 12.47 11.85   WN6 42 0
6 MR 55 WR* 15 15 32.6272277376 -59 02 30.695283672 12.46 12.56 11.84 11.63   WN6-w 68 0
7 HD 143414 WR* 16 03 49.3455286488 -62 41 35.941627680 9.32 10.03 10.10     WN6-w 109 0
8 HD 147419 WR* 16 24 26.2279587024 -51 32 06.061114140   11.46 10.50 10.74   WN6-s 108 0
9 MR 67 WR* 17 10 54.6274683720 -46 36 00.577401516   13.15 12.50 12.28   WN6 38 0
10 THA 31-1 WR* 17 11 21.7008844704 -39 53 21.976096632   14.18 13.01 12.54   WN7 38 0
11 LS 3982 WR* 17 14 27.1191622584 -39 45 47.051105904 10.63 10.95 10.41     WN6h-w 66 0
12 M 73 Cl* 20 59.0 -12 38     8.9     ~ 32 0

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2022.08.09-02:54:21

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