TY  - JOUR
A1  - Evans, Nancy Remage
A1  - DeGioia-Eastwood, Kathleen
A1  - Gagne, Marc
A1  - Townsley, Leisa
A1  - Broos, Patrick S.
A1  - Wolk, Scott J.
A1  - Naze, Yael
A1  - Corcoran, Michael
A1  - Oskinova, Lida
A1  - Moffat, Anthony F. J.
A1  - Wang, Junfeng
A1  - Walborn, Nolan R.
T1  - The search for low-mass companions of b stars in the Carina Nebula cluster trumpler 16
T2  - The astrophysical journal : an international review of spectroscopy and astronomical physics ; Supplement series
N2  - We have developed lists of likely B3-A0 stars (called "late B" stars) in the young cluster Trumpler 16. The following criteria were used: location within 3' of eta Car, an appropriate V and B - V combination, and proper motion (where available). Color and magnitude cuts have been made assuming an E(B - V) = 0.55 mag +/- 0.1, which is a good approximation close to the center of Trumpler 16. These lists have been cross-correlated with X-ray sources found in the Chandra Carina Complex Project. Previous studies have shown that only very rarely (if at all) do late main-sequence B stars produce X-rays. We present evidence that the X-ray-detected sources are binaries with low-mass companions, since stars less massive than 1.4 M-circle dot are strong X-ray sources at the age of the cluster. Both the median X-ray energies and X-ray luminosities of these sources are in good agreement with values for typical low-mass coronal X-ray sources. We find that 39% of the late B stars based on a list with proper motions have low-mass companions. Similarly, 32% of a sample without proper motions have low-mass companions. We discuss the X-ray detection completeness. These results on low-mass companions of intermediate-mass stars are complementary to spectroscopic and interferometric results and probe new parameter space of low-mass companions at all separations. They do not support a steeply rising distribution of mass ratios to low masses for intermediate-mass (5 M-circle dot) primaries, such as would be found by random pairing from the initial mass function.
KW  - open clusters and associations: individual (Trumpler 16)
KW  - stars: massive
Y1  - 2011
UR  - https://publishup.uni-potsdam.de/frontdoor/index/index/docId/36870
SN  - 0067-0049
VL  - 194
IS  - 1
PB  - IOP Publ. Ltd.
CY  - Bristol
ER  -