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.
techniques: photometric - techniques: spectroscopic - galaxy: open clusters and associations: general - galaxy: open clusters and associations: individual: Hogg 15 - stars: individual: WR 47
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