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VLT/SINFONI Observations of Spitzer/MIPSGAL 24 μm Circumstellar Shells: Revealing the Natures of Their Central Sources

Silva, K. M. and Flagey, N. and Noriega-Crespo, A. and Carey, S. and Ingallinera, A. (2017) VLT/SINFONI Observations of Spitzer/MIPSGAL 24 μm Circumstellar Shells: Revealing the Natures of Their Central Sources. Astronomical Journal, 153 (3). Art. No. 115. ISSN 1538-3881.

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We present Very Large Telescope/Spectrograph for INtegral Field Observations in the Near Infrared H- and K-band spectra of potential central stars within the inner 8''-by-8'' regions of 55 MIPSGAL "bubbles" (MBs), sub-arcminute circumstellar shells discovered in the mid-IR survey of the Galactic plane with Spitzer/MIPS. At magnitudes brighter than 15, we detect a total of 230 stars in the K band and 179 stars in the H band. We spectrally identify 145 stars in all but three MBs, with average magnitudes of 13.8 and 12.7 respectively, using spectral libraries and previous studies of near-IR stellar spectra. We also use tabulated intrinsic stellar magnitudes and colors to derive distances and extinction values, and to better constrain the classifications of the stars. We reliably identify the central sources for 21 of the 55 MBs, which we classify as follows: one Wolf–Rayet, three luminous blue variable candidates, four early-type (O to F), and 15 late-type (G to M) stars. The 21 central sources are, on average, one magnitude fainter than these in the most recent study of MBs, and we notice a significant drop in the fraction of massive star candidates. For the 34 remaining MBs in our sample, we are unable to identify the central sources due to confusion, low spectroscopic signal-to-noise ratio, and/or lack of detections in the images near the centers of the bubbles. We discuss how our findings compare with previous studies and support the trend, for the most part, between the shells' morphologies in the mid-IR and central sources spectral types.

Item Type:Article
Related URLs:
URLURL TypeDescription
Flagey, N.0000-0002-8763-1555
Noriega-Crespo, A.0000-0002-6296-8960
Carey, S.0000-0002-0221-6871
Ingallinera, A.0000-0002-3137-473X
Additional Information:© 2017 The American Astronomical Society. Received 2016 May 25; accepted 2016 November 21; published 2017 February 17. We thank K. Cooksey for careful reading of the manuscript and providing valuable feedback. We also thank the anonymous referee for constructive comments that helped improve the paper. This work was supported in part by the Canada–France–Hawaii Telescope Corporation, and is based on observations collected at the European Organisation for Astronomical Research in the Southern Hemisphere under ESO programme 093.D-0414. This publication makes use of data products from the Two Micron All Sky Survey, which is a joint project of the University of Massachusetts and the Infrared Processing and Analysis Center/California Institute of Technology, funded by the National Aeronautics and Space Administration and the National Science Foundation. This work is based in part on observations made with the Spitzer Space Telescope, which is operated by the Jet Propulsion Laboratory, California Institute of Technology under a contract with NASA.
Group:Infrared Processing and Analysis Center (IPAC)
Funding AgencyGrant Number
Canada–France–Hawaii Telescope CorporationUNSPECIFIED
European Southern Observatory (ESO)093.D-0414
Subject Keywords:Stars: early-type; stars: emission-line, Be; stars: late-type; stars: Wolf–Rayet
Issue or Number:3
Record Number:CaltechAUTHORS:20170221-170917250
Persistent URL:
Official Citation:K. M. Silva et al 2017 AJ 153 115
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:74445
Deposited By: Melissa Ray
Deposited On:22 Feb 2017 19:51
Last Modified:09 Mar 2020 13:19

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