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- Center for Astrophysics Harvard & SmithsonianUS436 papers
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21 papers · 2 filters
On the Use of Field RR Lyrae as Galactic Probes. II. A new S calibration to estimate their metallicity
J. Crestani, M. Fabrizio, V. F. Braga +33
We performed the largest and most homogeneous spectroscopic survey of field RR Lyraes (RRLs). We secured 6,300 high resolution (HR, R35,000) spectra for 143 RRLs (11…
Statistics of wide pre-main sequence binaries in the Orion OB1 association
Andrei Tokovinin, Monika Petr-Gotzens, Cesar Briceno
Statistics of low-mass pre-main sequence binaries in the Orion OB1 association with separations ranging from 0.6" to 20" (220 to 7400 au at 370 pc) are studied using images from th…
Short period variability in the globular cluster NGC 419 and the SMC field
Clara E. Martinez-Vazquez, Ricardo Salinas, A. Katherina Vivas
Delta Scuti ( Sct) stars have been extensively studied in our Galaxy, but far less in extragalactic systems. Here we study the population of Sct variables in NGC 419, an int…
Near-Infrared and Optical Observations of Type Ic SN2020oi and broad-lined Ic SN2020bvc: Carbon Monoxide, Dust and High-Velocity Supernova Ejecta
J. Rho, A. Evans, T. R. Geballe +33
We present near-infrared and optical observations of the Type Ic Supernova (SN) 2020oi in the galaxy M100 and the broad-lined Type Ic SN2020bvc in UGC 9379, using Gemini, LCO, SOAR…
Orbits of Five Triple Stars
Andrei Tokovinin, David Latham
Joint analysis of radial velocities and position measurements of five hierarchical stellar systems is undertaken to determine elements of their inner and outer orbits and, whenever…
Evolutionary and pulsation properties of Type II Cepheids
G. Bono, V. F. Braga, G. Fiorentino +7
We discuss the observed pulsation properties of Type II Cepheids (TIICs) in the Galaxy and Magellanic Clouds. The period (P) distributions, luminosity amplitudes and population rat…