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Rotationally variable A stars from TESS
Recently, high-precision optical 2-min cadence light curves obtained with TESS for targets located in the mission's defined first four sectors have been released. The majority... -
Starspots on A stars
Rotation modulation of Kepler light curves in mid-A to late-B stars is shown to be present. This is demonstrated by the high correlation of projected rotational velocities with... -
HD 32115 and HD 37594 atmospheric parameters
We present detailed parameter determinations of two chemically normal late A-type stars, HD 32115 and HD 37594, to uncover the reasons behind large discrepancies between two... -
Velocity Vectors of B and A stars
A compilation of proper motions, radial velocities, and apparent magnitudes of B and A stars is combined with the absolute magnitudes and colour excesses from the "Catalogue of... -
CH3OH in the HD100546 disk
Quantifying the composition of the material in protoplanetary disks is paramount to determining the potential for exoplanetary systems to produce and support habitable... -
4 A-type stars abundances and spectra
We present chemical composition and fundamental parameters (the effective temperature, surface gravity and radius) for four sharp-lined A-type stars gamma Gem (HD 41705),... -
SI abundances of 8 A-B stars
A comprehensive model atom was developed for Si I-II-III using the most up-to-date atomic data available so far. Based on non-local thermodynamic equilibrium (NLTE) line... -
Rotation and spots in normal A and Am/Fm stars
Frequency analysis of long-term ultraprecise photometry can lead to precise values of rotation frequencies of rotating stars with 'hump and spike' features in their... -
{delta} Scuti and {gamma} Doradus stars in TESS
We present the first asteroseismic results for {delta} Scuti and {gamma} Doradus stars observed in Sectors 1 and 2 of the TESS mission. We utilize the 2-min cadence TESS data... -
Rotational frequencies in A and B stars
It has long been thought that starspots are not present in the A and B stars because magnetic fields cannot be generated in stars with radiative envelopes. Space observations... -
Kepler {delta} Sct stars amplitude modulation
We present the results of a thorough search for amplitude modulation of pulsation modes in 983 {delta} Sct stars, which have effective temperatures between... -
Possible planets around A stars
Kepler photometry of A stars shows that a considerable fraction (about 19 per cent) have a peculiar feature in the periodogram. This feature consists of a broad peak, thought to... -
High-frequency A-type pulsators
We present the results of a survey using the WASP archive to search for high-frequency pulsations in F-, A- and B-type stars. Over 1.5 million targets have been searched for... -
VAST Survey. A-type stars multiplicity
With a combination of adaptive optics imaging and a multi-epoch common proper motion search, we have conducted a large volume-limited (D<=75pc) multiplicity survey of A-type... -
Activity in A-type stars from Kepler
Two years of Kepler data are used to investigate low-frequency variations in A-type stars. In about 875 (40%) A-type stars, the periodogram shows a simple peak and its harmonic.... -
Orbital motion monitoring of A-star multiples
As a part of our ongoing Volume-limited A-Star (VAST) adaptive optics survey, we have obtained observations of 26 binary systems with projected separations <100AU, 13 of... -
Absorption lines in 21 Lyn A-type star
We present a catalog of absorption lines in the z', Y, and J bands that we identified in 21 Lyn, a slowly rotating A0.5V star. We detected 155 absorption features in the... -
HK-Survey field horizontal-branch candidates
We present coordinates and available photometric information (either from previous or recent broadband UBV observations, and near-infrared photometry from the 2MASS Point Source... -
Horizontal-branch and A-type star catalog. II
We present coordinates and brightness estimates for 4175 candidate field horizontal-branch and A-type stars, in the magnitude range 10<=B<=15.5, selected using an... -
Properties of Galactic Be Supergiants. VI.
We report the results of long-term spectroscopic monitoring of the A-type supergiant with the B[e] phenomenon 3Pup=HD62623. We confirm earlier findings that it is a binary...