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

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...

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Autores principales:	Piatti, A.E., Bica, E., Santos Jr., J.F.C., Clariá, J.J.
Formato:	JOUR
Materias:	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
Acceso en línea:	http://hdl.handle.net/20.500.12110/paper_00046361_v387_n1_p108_Piatti
Aporte de:	Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires

id	todo:paper_00046361_v387_n1_p108_Piatti
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spelling	todo:paper_00046361_v387_n1_p108_Piatti2023-10-03T13:59:59Z A revision of the fundamental parameters of the open cluster Hogg 15 and the projected star WR 47 Piatti, A.E. Bica, E. Santos Jr., J.F.C. Clariá, J.J. 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 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. JOUR info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/2.5/ar http://hdl.handle.net/20.500.12110/paper_00046361_v387_n1_p108_Piatti
institution	Universidad de Buenos Aires
institution_str	I-28
repository_str	R-134
collection	Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
topic	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
spellingShingle	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 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
topic_facet	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
description	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.
format	JOUR
author	Piatti, A.E. Bica, E. Santos Jr., J.F.C. Clariá, J.J.
author_facet	Piatti, A.E. Bica, E. Santos Jr., J.F.C. Clariá, J.J.
author_sort	Piatti, A.E.
title	A revision of the fundamental parameters of the open cluster Hogg 15 and the projected star WR 47
title_short	A revision of the fundamental parameters of the open cluster Hogg 15 and the projected star WR 47
title_full	A revision of the fundamental parameters of the open cluster Hogg 15 and the projected star WR 47
title_fullStr	A revision of the fundamental parameters of the open cluster Hogg 15 and the projected star WR 47
title_full_unstemmed	A revision of the fundamental parameters of the open cluster Hogg 15 and the projected star WR 47
title_sort	revision of the fundamental parameters of the open cluster hogg 15 and the projected star wr 47
url	http://hdl.handle.net/20.500.12110/paper_00046361_v387_n1_p108_Piatti
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A revision of the fundamental parameters of the open cluster Hogg 15 and the projected star WR 47

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