View Full Document

ISOLATED, MASSIVE SUPERGIANTS NEAR THE GALACTIC CENTER



View the full content.
View Full Document
View Full Document

3 views

Unformatted text preview:

The Astrophysical Journal 638 183 190 2006 February 10 2006 The American Astronomical Society All rights reserved Printed in U S A ISOLATED MASSIVE SUPERGIANTS NEAR THE GALACTIC CENTER M P Muno 1 2 G C Bower 3 A J Burgasser 4 5 6 F K Baganoff 7 M R Morris 1 and W N Brandt8 Receivved 2005 July 1 accepted 2005 October 6 ABSTRACT We have carried out a pilot project to assess the feasibility of using radio infrared and X ray emission to identify young massive stars located between 1 and 25 pc from the Galactic center We first compared catalogs compiled from the VLA Chandra and 2MASS We identified two massive young stars the previously identified star that is associated with the radio H ii region H2 and a newly identified star that we refer to as CXOGC J174516 1 290315 The infrared spectra of both stars exhibit very strong Br and He i lines and resemble those of massive supergiants that have evolved off of the main sequence but not yet reached the Wolf Rayet phase We estimate that each star has a bolometric luminosity k106 L These two stars are also associated with bright mid infrared sources from the MSX survey although the origin of this emission is uncertain Likewise the detection of these two sources in X rays is surprising because stars at similar evolutionary states are not uniformly bright X ray sources Therefore we suggest that both stars are in binary systems that contain either OB stars whose winds collide with those of the luminous supergiants or compact objects that are accreting from the winds of the supergiants We also identify X ray emission from a nitrogentype Wolf Rayet star and place upper limits on the X ray luminosities of three more evolved massive stars that previously have been identified between 1 and 25 pc from Sgr A Finally we briefly discuss the implications that future searches for young stars will have for our understanding of the recent history of star formation near the Galactic center Subject headinggs Galaxy center infrared stars radio



Access the best Study Guides, Lecture Notes and Practice Exams

Loading Unlocking...
Login

Join to view ISOLATED, MASSIVE SUPERGIANTS NEAR THE GALACTIC CENTER and access 3M+ class-specific study document.

or
We will never post anything without your permission.
Don't have an account?
Sign Up

Join to view ISOLATED, MASSIVE SUPERGIANTS NEAR THE GALACTIC CENTER and access 3M+ class-specific study document.

or

By creating an account you agree to our Privacy Policy and Terms Of Use

Already a member?