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Abstract:

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 HDE311884 (WR 47) - often proposed to be physically related to Hogg 15. Based on the WR 47 spectrum and available photometry, we conclude that the short distance implied by the Hipparcos parallax (216 pc) 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 ± 0.9 kpc, respectively. For Hogg 15 we derive an age of 20 ± 10 Myr, a reddening of 1.10 ± 0.05, and a distance of 3.1 ± 0.5 kpc. 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.

Registro:

Documento: Artículo
Título:A revision of the fundamental parameters of the open cluster Hogg 15 and the projected star WR 47
Autor:Piatti, A.E.; Bica, E.; Santos Jr., J.F.C.; Clariá, J.J.
Filiación:Inst. de Astron. y Fis. del Espacio, CC 67, Suc. 28, 1428 Buenos Aires, Argentina
Palabras clave:Galaxy: open clusters and associations: general; Galaxy: open clusters and associations: individual: Hogg 15; Stars: individual: WR; Techniques: photometric; Techniques: spectroscopic; Galaxies; Photometry; Space research; Spectroscopic analysis; Color magnitude diagrams (CMD); Astrophysics
Año:2002
Volumen:387
Número:1
Página de inicio:108
Página de fin:116
DOI: http://dx.doi.org/10.1051/0004-6361:20020373
Título revista:Astronomy and Astrophysics
Título revista abreviado:Astron. Astrophys.
ISSN:00046361
CODEN:AAEJA
Registro:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00046361_v387_n1_p108_Piatti

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Citas:

---------- APA ----------
Piatti, A.E., Bica, E., Santos Jr., J.F.C. & Clariá, J.J. (2002) . A revision of the fundamental parameters of the open cluster Hogg 15 and the projected star WR 47. Astronomy and Astrophysics, 387(1), 108-116.
http://dx.doi.org/10.1051/0004-6361:20020373
---------- CHICAGO ----------
Piatti, A.E., Bica, E., Santos Jr., J.F.C., Clariá, J.J. "A revision of the fundamental parameters of the open cluster Hogg 15 and the projected star WR 47" . Astronomy and Astrophysics 387, no. 1 (2002) : 108-116.
http://dx.doi.org/10.1051/0004-6361:20020373
---------- MLA ----------
Piatti, A.E., Bica, E., Santos Jr., J.F.C., Clariá, J.J. "A revision of the fundamental parameters of the open cluster Hogg 15 and the projected star WR 47" . Astronomy and Astrophysics, vol. 387, no. 1, 2002, pp. 108-116.
http://dx.doi.org/10.1051/0004-6361:20020373
---------- VANCOUVER ----------
Piatti, A.E., Bica, E., Santos Jr., J.F.C., Clariá, J.J. A revision of the fundamental parameters of the open cluster Hogg 15 and the projected star WR 47. Astron. Astrophys. 2002;387(1):108-116.
http://dx.doi.org/10.1051/0004-6361:20020373