Analysis of the WN star WR 102c, its WR nebula, and the associated cluster of massive stars in the Sickle Nebula

Abstract

The massive Wolf-Rayet type star WR 102c is located near the Quintuplet Cluster - one of the three massive star clusters in the Galactic Center region. Previous studies indicated that WR 102c may have a dusty circumstellar nebula and is among the main ionizing sources of the Sickle Nebula associated with the Quintuplet cluster. We obtained observations with the ESO's VLT integral field spectrograph SINFONI in the K-band, extracted the stellar spectra, and analyzed them by means of stellar atmosphere models. Our new analysis supersedes the results reported for WR 102c previously. We significantly revise down its bolometric luminosity and hydrogen content. We detect four early OB type stars close to WR 102c. These stars have radial velocities similar to that of WR 102c. We suggest that together with WR 102c these stars belong to a distinct star cluster with a total mass of about 1000 M_sun. We identify a new WR nebula around WR 102c in the SINFONI map of the diffuse Br$\gamma$ emission and in the HST's Pa$\alpha$ images. The Br$\gamma$ line at different locations is not significantly broadened and similar to the width of nebular emission elsewhere in the H II region around WR 102c. The massive star WR 102c located in the Galactic Center region resides in a star cluster containing further early type stars. The stellar parameters of WR 102c are typical for hydrogen-free WN6 stars. We newly identify a nebula surrounding WR 102c 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 previous evolutionary stage of WR 102c.

arXiv comment10 pages, 10 figures, accepted for publication in A&A

References in corpus (57)

• On the variation of the Initial Mass Function
• A grid of MARCS model atmospheres for late-type stars I. Methods and general properties
• Grids of stellar models with rotation - I. Models from 0.8 to 120 Msun at solar metallicity (Z = 0.014)
• Cosmic-Ray Rejection by Laplacian Edge Detection
• The Infrared Spectrograph on the Spitzer Space Telescope
• The UKIDSS Galactic Plane Survey
• HST/NICMOS Observations of Massive Stellar Clusters Near the Galactic Center
• Massive Stars in the Quintuplet Cluster
• The Galactic WN stars: Spectral analyses with line-blanketed model atmospheres versus stellar evolution models with and without rotation
• The Galactic WC stars: Stellar parameters from spectral analyses indicate a new evolutionary sequence
• Neglecting the porosity of hot-star winds can lead to underestimating mass-loss rates
• The Wolf-Rayet stars in the Large Magellanic Cloud: A comprehensive analysis of the WN class
• Mass segregation and fractal substructure in young massive clusters: (I) the McLuster code and method calibration
• A Medium Resolution Near-Infrared Spectral Atlas of O and Early B Stars
• The ages of young star clusters, massive blue stragglers and the upper mass limit of stars: analysing age dependent stellar mass functions
• On the consistent treatment of the quasi-hydrostatic layers in hot star atmospheres
• Thickening of galactic disks through clustered star formation
• Really Cool Stars and the Star Formation History at the Galactic Center
• An Analysis of the Shapes of Interstellar Extinction Curves. VI. The Near-IR Extinction Law
• Massive stars and the energy balance of the interstellar medium. II. The 35 solar mass star and a solution to the "missing wind problem"
• A Hidden Population of Massive Stars with Circumstellar Shells Discovered with the Spitzer Space Telescope
• Evolution of X-ray emission from young massive star clusters
• Early magnetic B-type stars: X-ray emission and wind properties
• The Interplay between Star Formation and the Nuclear Environment of our Galaxy: Deep X-ray Observations of the Galactic Center Arches and Quintuplet Clusters
• HST Paschen-alpha Survey of the Galactic Center: Data Reduction and Products
• Mapping the Milky Way bulge at high resolution: the 3D dust extinction, CO, and X factor maps
• Radiation-Hydrodynamic Models of the evolving Circumstellar Medium around Massive Stars
• The WR population predicted by massive single star and by massive binary evolution
• HST/NICMOS Paschen-alpha Survey of the Galactic Center: Overview
• Isolated Wolf-Rayet Stars and O Supergiants in the Galactic Center Region Identified via Paschen-alpha Excess
• Point Sources from a Spitzer IRAC Survey of the Galactic Center
• Mid-infrared imaging and spectroscopy of the enigmatic cocoon stars in the Quintuplet Cluster
• Really Cool Stars at the Galactic Center
• The Conspicuous Absence of X-ray Emission from Carbon-Enriched Wolf-Rayet Stars
• Red Eyes on Wolf-Rayet Stars: 60 New Discoveries via Infrared Color Selection
• Pinwheels in the Quintuplet Cluster
• The Quintuplet Cluster I. A K-band spectral catalog of stellar sources
• X-ray Observations of Stellar Clusters Near the Galactic Center
• The impact of rotation on the line profiles of Wolf-Rayet stars
• Two extremely luminous WN stars in the Galactic center with circumstellar emission from dust and gas
• The Quintuplet Cluster III. Hertzsprung-Russell diagram and cluster age
• Rotating Wolf-Rayet stars in a post RSG/LBV phase. An evolutionary channel towards long-duration GRBs?
• Constraints on gamma-ray burst and supernova progenitors through circumstellar absorption lines. (II): Post-LBV Wolf-Rayet stars
• Results from a Near Infrared Search for Emission-line Stars in the Inner Galaxy: Spectra of New Wolf-Rayet Stars
• The Quintuplet Cluster II. Analysis of the WN stars
• Isolated massive stars in the Galactic center: The dynamic contribution from the Arches and Quintuplet star clusters
• Discovery of a new Wolf-Rayet star and its ring nebula in Cygnus
• Profile Shapes for Optically Thick X-ray Emission Lines from Stellar Winds
• The orbital motion of the Quintuplet cluster - a common origin for the Arches and Quintuplet clusters?
• WISE morphological study of Wolf-Rayet nebulae
• One of the most massive stars in the Galaxy may have formed in isolation
• In pursuit of gamma-ray burst progenitors: the identification of a sub-population of rotating Wolf-Rayet stars
• Spitzer/IRS investigation of MIPSGAL 24 microns compact bubbles
• Metallicity distribution of red giants in the Inner Galaxy from Near Infrared spectra
• WR 120bb and WR 120bc: a pair of WN9h stars with possibly interacting circumstellar shells
• Discovery of a new Wolf-Rayet star and a candidate star cluster in the Large Magellanic Cloud with Spitzer
• An Apparent Precessing Helical Outflow from a Massive Evolved Star: Evidence for Binary Interaction

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• An updated stellar census of the Quintuplet cluster
• Constraining the population of isolated massive stars within the Central Molecular Zone
• SOFIA/FORCAST Galactic Center Legacy Survey: Overview
• On the binary nature of massive blue hypergiants: high-resolution X-ray spectroscopy suggests that Cyg OB2 12 is a colliding wind binary
• IRTF/TEXES Observations of the HII Regions H1 and H2 in the Galactic Centre