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The VMC Survey -- XL. Three-dimensional structure of the Small Magellanic Cloud as derived from red clump stars
B. L. Tatton, J. Th. van Loon, M. -R. L. Cioni +12
Galaxy interactions distort the distribution of baryonic matter and can affect star formation. The nearby Magellanic Clouds are a prime example of an ongoing galaxy interaction pro…
TESS observations of Cepheid stars: first light results
E. Plachy, A. Pál, A. Bódi +33
We present the first analysis of Cepheid stars observed by the TESS space mission in Sectors 1 to 5. Our sample consists of 25 pulsators: ten fundamental mode, three overtone and t…
Gaia Early Data Release 3: Acceleration of the solar system from Gaia astrometry
Gaia Collaboration, S. A. Klioner, F. Mignard +414
Context. Gaia Early Data Release 3 (Gaia EDR3) provides accurate astrometry for about 1.6 million compact (QSO-like) extragalactic sources, 1.2 million of which have the best-quali…
New insights into the use of Ultra Long Period Cepheids as cosmological standard candles
Ilaria Musella, Marcella Marconi, Roberto Molinaro +4
Ultra Long Period Cepheids (ULPs) are pulsating variable stars with a period longer than 80d and have been hypothesized to be the extension of the Classical Cepheids (CCs) at highe…
A theoretical scenario for Galactic RR Lyrae in the Gaia database: constraints on the parallax offset
Marcella Marconi, Roberto Molinaro, Vincenzo Ripepi +5
On the basis of an extended set of nonlinear convective RR Lyrae pulsation models we derive the first theoretical light curves in the Gaia bands and the corresponding intensity-wei…
The RR Lyrae projected density distribution from the Galactic centre to the halo
Maria Gabriela Navarro, Dante Minniti, Roberto Capuzzo-Dolcetta +4
The projected density distribution of type ab RR Lyrae (RRab) stars was characterised from the innermost regions of the Milky Way to the halo, with the aim of placing constraints o…