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24 papers · 2 filters
Stellar Granulation as the Source of High-Frequency Flicker in Kepler Light Curves
Steven R. Cranmer, Fabienne A. Bastien, Keivan G. Stassun +1
A large fraction of cool, low-mass stars exhibit brightness fluctuations that arise from a combination of convective granulation, acoustic oscillations, magnetic activity, and stel…
Evaluating Gyrochronology on the Zero-Age-Main-Sequence: Rotation Periods in the Southern Open Cluster Blanco 1 from the KELT-South Survey
P. A. Cargile, D. J. James, J. Pepper +3
We report periods for 33 members of Blanco 1 as measured from KELT-South light curves, the first reported rotation periods for this benchmark zero-age-main-sequence open cluster. T…
Predicting the Sun's Polar Magnetic Fields with a Surface Flux Transport Model
Lisa Upton, David H. Hathaway
The Sun's polar magnetic fields are directly related to solar cycle variability. The strength of the polar fields at the start (minimum) of a cycle determine the subsequent amplitu…
Star Formation in Orion's L1630 Cloud: an Infrared and Multi-epoch X-ray Study
David A. Principe, Joel H. Kastner, Nicolas Grosso +4
X-ray emission is characteristic of young stellar objects (YSOs) and is known to be highly variable. We investigate, via an infrared and multi-epoch X-ray study of the L1630 dark c…
A Catalogue of Temperatures for Kepler Eclipsing Binary Stars
D. J. Armstrong, Y. Gómez Maqueo Chew, F. Faedi +1
We have combined the Kepler Eclipsing Binary Catalogue with information from the HES, KIS and 2MASS photometric surveys to produce spectral energy distribution fits to over 2600 ec…
Molecules in the transition disk orbiting T Cha
G. G. Sacco, J. H. Kastner, T. Forveille +4
We seek to establish the presence and properties of gas in the circumstellar disk orbiting T Cha, a nearby (d~110 pc), relatively evolved (age ~5-7 Myr) yet actively accreting 1.5…
Radial Velocity Variations of Photometrically Quiet, Chromospherically Inactive Kepler Stars: A Link Between RV Jitter and Photometric Flicker
Fabienne A. Bastien, Keivan G. Stassun, Joshua Pepper +6
We compare stellar photometric variability, as measured from Kepler light curves by Basri et al. (2011), with measurements of radial velocity (RV) root-mean-square (RMS) variations…
EL CVn-type binaries - Discovery of 17 helium white dwarf precursors in bright eclipsing binary star systems
P. F. L. Maxted, S. Bloemen, U. Heber +21
The star 1SWASP J024743.37-251549.2 was recently discovered to be a binary star in which an A-type dwarf star eclipses the remnant of a disrupted red giant star (WASP0247-25B). The…
RR Lyrae in the LMC: Insights Into the Oosterhoff Phenomenon
Charles A Kuehn, Horace A. Smith, Marcio Catelan +8
Although more than eight decades have passed since P. Th. Oosterhoff drew attention to differences in the properties of RR Lyrae variables in globular clusters, the origin and sign…
Colors of c-type RR Lyrae Stars and Interstellar Reddening
Andrew Layden, Tyler Anderson, Paul Husband
RR Lyrae stars pulsating in the fundamental mode have long been used to measure interstellar reddening, based on their observed uniformity of color at minimum light after sma…
The Short Period End of the Distribution of Contact Binary Stars
Lawrence A. Molnar, Daniel M. Van Noord, Steven D. Steenwyk
Contact binary systems (also known as W UMa systems) consist of a pair of hydrogen-burning dwarf stars orbiting each other so closely that they share a common envelope. Although th…
Angular momentum evolution of young low-mass stars and brown dwarfs: observations and theory
J. Bouvier, S. P. Matt, S. Mohanty +3
This chapter aims at providing the most complete review of both the emerging concepts and the latest observational results regarding the angular momentum evolution of young low-mas…
An observational correlation between stellar brightness variations and surface gravity
Fabienne A. Bastien, Keivan G. Stassun, Gibor Basri +1
Surface gravity is one of a star's basic properties, but it is difficult to measure accurately, with typical uncertainties of 25-50 per cent if measured spectroscopically and 90-15…
Occultation of the T Tauri Star RW Aurigae A by its Tidally Disrupted Disk
Joseph E. Rodriguez, Joshua Pepper, Keivan G. Stassun +4
RW Aur A is a classical T Tauri star, believed to have undergone a reconfiguration of its circumstellar environment as a consequence of a recent fly-by of its stellar companion, RW…
The SDSS-III APOGEE Radial Velocity Survey of M dwarfs I: Description of Survey and Science Goals
R. Deshpande, C. H. Blake, C. F. Bender +28
We are carrying out a large ancillary program with the SDSS-III, using the fiber-fed multi-object NIR APOGEE spectrograph, to obtain high-resolution H-band spectra of more than 120…
KIC 4544587: an Eccentric, Short Period Binary System with delta Sct Pulsations and Tidally Excited Modes
K. M. Hambleton, D. W. Kurtz, A. Prsa +7
We present Kepler photometry and ground based spectroscopy of KIC 4544587, a short-period eccentric eclipsing binary system with self-excited pressure and gravity modes, tidally ex…
Kepler Eclipsing Binary Stars. IV. Precise Eclipse Times for Close Binaries and Identification of Candidate Three-Body Systems
Kyle E. Conroy, Andrej Prsa, Keivan G. Stassun +3
We present a catalog of precise eclipse times and analysis of third body signals among 1279 close binaries in the latest Kepler Eclipsing Binary Catalog. For these short period bin…
MARVELS-1: A face-on double-lined binary star masquerading as a resonant planetary system; and consideration of rare false positives in radial velocity planet searches
Jason T. Wright, Arpita Roy, Suvrath Mahadevan +24
We have analyzed new and previously published radial velocity observations of MARVELS-1, known to have an ostensibly substellar companion in a ~6- day orbit. We find significant (~…
Studies of NGC 6720 with Calibrated HST WFC3 Emission-Line Filter Images--III:Tangential Motions using AstroDrizzle Images
C. R. O'Dell, G. J. Ferland, W. J. Henney +1
We have been able to compare with astrometric precision AstroDrizzle processed images of NGC 6720 (the Ring Nebula) made using two cameras on the Hubble Space Telescope. The time d…
The Hubble Space Telescope Treasury Program on the Orion Nebula Cluster
M. Robberto, D. R. Soderblom, E. Bergeron +27
The Hubble Space Telescope (HST) Treasury Program on the Orion Nebula Cluster has used 104 orbits of HST time to image the Great Orion Nebula region with the Advanced Camera for Su…
Reanalysis of the Radii of the Benchmark Eclipsing Binary V578 Mon
E. V. Garcia, Keivan G. Stassun, Guillermo Torres
V578 Mon is an eclipsing binary system in which both stars have masses above 10 Msun determined with an accuracy better than 3%. It is one of only five such massive eclipsing binar…
A CHARA Array Survey of Circumstellar Disks around Nearby Be-type Stars
Y. Touhami, D. R. Gies, G. H. Schaefer +11
We report on a high angular resolution survey of circumstellar disks around 24 northern sky Be stars. The K-band continuum survey was made using the CHARA Array long baseline inter…
Physical Parameters for RR Lyrae Stars in the SDSS Filter System
M. Catelan, G. I. Torrealba, C. Caceres +3
We present a calibration of the metallicity and physical parameters (temperature, luminosity, gravity, mass, radius) for RR Lyrae stars using the ugriz SDSS photometric system. Our…
FUV Detection of the Suspected Subdwarf Companion to the Be Star 59 Cygni
Geraldine J. Peters, Tiffany D. Pewett, Douglas R. Gies +2
We report on the detection of a hot subdwarf component in the Be binary system, 59 Cygni. The spectral signature is found in cross-correlation functions of photospheric model spect…