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SMHASH: Anatomy of the Orphan Stream using RR Lyrae stars
David Hendel, Victoria Scowcroft, Kathryn V. Johnston +30
Stellar tidal streams provide an opportunity to study the motion and structure of the disrupting galaxy as well as the gravitational potential of its host. Streams around the Milky…
The Araucaria Project: The distance to the Fornax Dwarf Galaxy from near-infrared photometry of RR Lyrae stars
P. Karczmarek, G. Pietrzyński, M. Górski +2
We have obtained single-phase near-infrared (NIR) magnitudes in the J- and K-bands for 77 RR Lyrae (RRL) stars in the Fornax Dwarf Spheroidal Galaxy. We have used different theoret…
Observational calibration of the projection factor of Cepheids IV. Period-projection factor relation of Galactic and Magellanic Cloud Cepheids
A. Gallenne, P. Kervella, A. Mérand +4
We focus on empirically measure the p-factor of a homogeneous sample of 29 LMC and 10 SMC Cepheids for which an accurate average LMC/SMC distance were estimated from eclipsing bina…
The Araucaria Project. The Distance to the Sculptor Group Galaxy NGC 7793 from Near-Infrared Photometry of Cepheid Variables
Bartlomiej Zgirski, Wolfgang Gieren, Grzegorz Pietrzynski +7
Following the earlier discovery of classical Cepheid variables in the Sculptor Group spiral galaxy NGC 7793 from an optical wide-field imaging survey, we have performed deep near-i…
Four years' interferometric observations of Galactic binary Cepheids
A. Gallenne, A. Merand, P. Kervella +4
We give an update on our long-term program of Galactic Cepheids started in 2012, whose goal is to measure the visual orbits of Cepheid companions. Using the VLTI/PIONIER and CHARA/…
LMC Blue Supergiant Stars and the Calibration of the Flux-weighted Gravity--Luminosity Relationship
M. A. Urbaneja, R. P. Kudritzki, W. Gieren +3
High quality spectra of 90 blue supergiant stars in the Large Magellanic Cloud are analyzed with respect to effective temperature, gravity, metallicity, reddening, extinction and e…
A precision determination of the Effect of Metallicity on Cepheid absolute magnitudes in VIJHK bands from Magellanic Cloud Cepheids
Piotr Wielgorski, Grzegorz Pietrzynski, Wolfgang Gieren +8
Using high-quality observed period-luminosity relations in both Magellanic Clouds in VIJHKs bands and optical and near-infrared Wesenheit indices we determine the effect of metalli…
Mass and p-factor of the type II Cepheid OGLE-LMC-T2CEP-098 in a binary system
Bogumił Pilecki, Wolfgang Gieren, Radosław Smolec +10
We present the results of a study of the type II Cepheid () in the eclipsing binary system OGLE-LMC-T2CEP-098 (). The Cepheid belongs to the…
Toward a renewed Galactic Cepheid distance scale from Gaia and optical interferometry
Pierre Kervella, Antoine Mérand, Alexandre Gallenne +9
Through an innovative combination of multiple observing techniques and mod- eling, we are assembling a comprehensive understanding of the pulsation and close environment of Cepheid…
Physical properties of the first spectroscopically confirmed red supergiant stars in the Sculptor Group galaxy NGC 55
L. R. Patrick, C. J. Evans, B. Davies +5
We present K-band Multi-Object Spectrograph (KMOS) observations of 18 Red Supergiant (RSG) stars in the Sculptor Group galaxy NGC 55. Radial velocities are calculated and are shown…
Observational calibration of the projection factor of Cepheids - III. The long-period Galactic Cepheid RS Puppis
Pierre Kervella, Boris Trahin, Howard E. Bond +10
The projection factor (p-factor) is an essential component of the classical Baade-Wesselink (BW) technique, that is commonly used to determine the distances to pulsating stars. It…
HARPS-N high spectral resolution observations of Cepheids I. The Baade-Wesselink projection factor of δ Cep revisited
N. Nardetto, E. Poretti, M. Rainer +13
The projection factor p is the key quantity used in the Baade-Wesselink (BW) method for distance determination; it converts radial velocities into pulsation velocities. Several met…