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485 papers · 1 filter
HD 91669b: A New Brown Dwarf Candidate from the McDonald Observatory Planet Search
Robert A. Wittenmyer, Michael Endl, William D. Cochran +4
We report the detection of a candidate brown dwarf orbiting the metal-rich K dwarf HD 91669, based on radial-velocity data from the McDonald Observatory Planet Search. HD 91669b is…
Triggered star formation on the borders of the Galactic HII region RCW 82
M. Pomares, A. Zavagno, L. Deharveng +6
We are engaged in a multi-wavelength study of several Galactic HII regions that exhibit signposts of triggered star formation on their borders, and where the collect and collapse p…
Binarity and multiperiodicity in high-amplitude delta Scuti stars
A. Derekas, L. L. Kiss, T. R. Bedding +10
We have carried out a photometric and spectroscopic survey of bright high-amplitude delta Scuti (HADS) stars. The aim was to detect binarity and multiperiodicity (or both) in order…
Infrared Studies of Molecular Shocks in the Supernova Remnant HB21: I. Thermal Admixture of Shocked H_2 Gas in the North
Jong-Ho Shinn, Bon-Chul Koo, Michael G. Burton +2
We present near- and mid-infrared observations on the shock-cloud interaction region in the northern part of the supernova remnant HB21, performed with the InfraRed Camera (IRC) ab…
Physical and chemical conditions in methanol maser selected hot-cores and UCHII regions
C. R. Purcell, S. N. Longmore, M. G. Burton +4
We present the results of a targeted 3-mm spectral line survey towards the eighty-three 6.67 GHz methanol maser selected star forming clumps observed by Purcell et al. 2006. In add…
On the origin of double main-sequence turn-offs in star clusters of the Magellanic Clouds
K. Bekki, A. D. Mackey
Recent observational studies of intermediate-age star clusters (SCs) in the Large Magellanic Cloud (LMC) have reported that a significant number of these objects show double main-s…