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Spectral classification and properties of the O Vz stars in the galactic O-star spectroscopic survey (GOSSS)
(IOP Publishing, 2016-08)
On the basis of the Galactic O Star Spectroscopic Survey (GOSSS), we present a detailed systematic investigation of the O Vz stars. The currently used spectral classification criteria are rediscussed, and the Vz phenomenon ...
Distinguishing post-AGB impostors in a sample of pre-main sequence stars
(EDP SCIENCES S A, 2011)
Context. A sample of 27 sources, cataloged as pre-main sequence stars by the Pico dos Dias Survey (PDS), is analyzed to investigate a possible contamination by post-AGB stars. The far-infrared excess due to dust present ...
A SEARCH FOR FIELD HORIZONTAL-BRANCH STARS NEAR THE SOUTH GALACTIC POLE
(IOP PUBLISHING LTD, 2010)
Searches for field horizontal-branch (FHB) stars in the halo of the Galaxy in the past have been carried out by several techniques, such as objective-prism surveys and visual or infrared photometric surveys. By choosing ...
A K-band spectral mini-survey of Galactic B[e] stars
(Oxford University Press, 2014-09)
We present a mini-survey of Galactic B[e] stars mainly undertaken with the Large Binocular Telescope (LBT). B[e] stars show morphological features with hydrogen emission lines and an infrared excess, attributed to warm ...
Detection of a giant flare displaying quasi-periodic pulsations from a pre-main-sequence M star by the Next Generation Transit Survey
(Oxford University Press, 2019)
We present the detection of an energetic flare on the pre-main-sequence M3 star NGTS J121939.5–355557, which we estimate to be only 2 Myr old. The flare had an energy of 3.2 ±0 0 4 3 ×1036 erg and a fractional amplitude ...
Probing the ejecta of evolved massive stars in transition: A VLT/SINFONI K-band survey
(Edp Sciences, 2013-10)
Massive evolved stars in transition phases, such as Luminous Blue Variables (LBVs), B[e] Supergiants (B[e]SGs), and Yellow Hypergiants (YHGs), are not well understood, and yet crucial steps in determining accurate stellar ...
THE PAN-PACIFIC PLANET SEARCH. VI. GIANT PLANETS ORBITING HD 86950 AND HD 222076
(IOP PUBLISHING LTD, 2017)
We report the detection of two new planets orbiting the K giants HD 86950 and HD 222076, based on precise radial velocities obtained with three instruments: AAT/UCLES, FEROS, and CHIRON. HD 86950b has a period of 1270 +/- ...
Photometric Observations of Grid Giant Star Survey Candidates
(2004)
We compare variability of radial velocity (RV) and brightness for a sam-ple of red giants which were selected as candidates for the Grid Giant StarSurvey (GGSS). The purpose of the survey is to select astrometrically sta-ble ...