Universität zu Köln

Steinke, M., Oskinova, L. M., Hamann, W. -R., Sander, A., Liermann, A. and Todt, H. (2016). Analysis of the WN star WR102c, its WR nebula, and the associated cluster of massive stars in the Sickle Nebula. Astron. Astrophys., 588. LES ULIS CEDEX A: EDP SCIENCES S A. ISSN 1432-0746

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Abstract

Context. The massive Wolf-Rayet type star WR102c is located near the Quintuplet Cluster, one of the three massive star clusters in the Galactic centre region. Previous studies indicated that WR102c may have a dusty circumstellar nebula and is among the main ionising sources of the Sickle Nebula associated with the Quintuplet Cluster. Aims. The goals of our study are to derive the stellar parameters of WR102c from the analysis of its spectrum and to investigate its stellar and nebular environment. Methods. We obtained observations with the ESO VLT integral field spectrograph SINFONI in the K-band, extracted the stellar spectra, and analysed them by means of stellar atmosphere models. Results. Our new analysis supersedes the results previously reported for WR102c. We significantly decrease its bolometric luminosity and hydrogen content. We detect four early OB type stars close to WR102c. These stars have radial velocities similar to that of WR102c. We suggest that together with WR102c these stars belong to a distinct star cluster with a total mass of similar to 1000 M-circle dot. We identify a new WR nebula around WR102c in the SINFONI map of the di ff use Br gamma emission and in the HST Pa ff images. The Br gamma line at di ff erent locations is not significantly broadened and similar to the width of nebular emission elsewhere in the H i i region around WR102c. Conclusions. The massive star WR102c located in the Galactic centre region resides in a star cluster containing additional early-type stars. The stellar parameters of WR102c are typical for hydrogen-free WN6 stars. We identify a nebula surrounding WR102c that has a morphology similar to other nebulae around hydrogen-free WR stars, and propose that the formation of this nebula is linked to interaction of the fast stellar wind with the matter ejected at a previous evolutionary stage of WR102c.

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Steinke, M. UNSPECIFIED UNSPECIFIED UNSPECIFIED Oskinova, L. M. UNSPECIFIED UNSPECIFIED UNSPECIFIED Hamann, W. -R. UNSPECIFIED UNSPECIFIED UNSPECIFIED Sander, A. UNSPECIFIED UNSPECIFIED UNSPECIFIED Liermann, A. UNSPECIFIED UNSPECIFIED UNSPECIFIED Todt, H. UNSPECIFIED UNSPECIFIED UNSPECIFIED
URN:	urn:nbn:de:hbz:38-279677
DOI:	10.1051/0004-6361/201527692
Journal or Publication Title:	Astron. Astrophys.
Volume:	588
Date:	2016
Publisher:	EDP SCIENCES S A
Place of Publication:	LES ULIS CEDEX A
ISSN:	1432-0746
Language:	English
Faculty:	Unspecified
Divisions:	Unspecified
Subjects:	no entry
Uncontrolled Keywords:	Keywords Language WOLF-RAYET STARS; BLANKETED MODEL ATMOSPHERES; LARGE-MAGELLANIC-CLOUD; PASCHEN-ALPHA SURVEY; GALACTIC-CENTER; INTERSTELLAR EXTINCTION; SPECTRAL-ANALYSES; STELLAR CLUSTERS; INNER GALAXY; RING NEBULA Multiple languages Astronomy & Astrophysics Multiple languages
Refereed:	Yes
URI:	http://kups.ub.uni-koeln.de/id/eprint/27967