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HD 207651: a Composite Spectrum Triple System

Fekel, Francis C.

From numerous radial velocities obtained at KPNO and Fairborn Observatory, we have determined the orbital elements of the composite spectrum triple system HD 207651. This system consists of a broad-lined A8 V star and an unseen M dwarf companion in a 1.470739 days orbit. Variations of the center-of-mass velocity of this short-period system and vel…

A Statistical Study of H I Gas in Nearby Narrow-Line AGN-Hosting Galaxies

Wu, Hong; Zhu, Yi-Nan

As a quenching mechanism, active galactic nucleus (AGN) feedback could suppress on going star formation in host galaxies. On the basis of a sample of galaxies selected from the Arecibo Legacy Fast ALFA (ALFALFA) H i survey, the dependence of the H i mass (M_{H i}), stellar mass (M_*), and H i-to-stellar mass ratio (M_{H i}

Source-plane Reconstruction of the Giant Gravitational Arc in A2667: A Candidate Wolf-Rayet Galaxy at z ~ 1

Richard, Johan; Izzo, Luca; Jullo, Eric +3 more

We present a new analysis of Hubble Space Telescope, Spitzer Space Telescope, and Very Large Telescope imaging and spectroscopic data of a bright lensed galaxy at z = 1.0334 in the lensing cluster A2667. Using this high-resolution imaging, we present an updated lens model that allows us to fully understand the lensing geometry and reconstruct the …

Self-consistent Orbits and Physical Properties for Eight Single-lined Spectroscopic Binaries

Wang, Xiaoli; Ren, Shulin; Fu, Yanning

For single-lined spectroscopic binaries (SB1s), self-consistent orbits can be determined via a simultaneous fit including both radial velocity data and the Hipparcos Intermediate Astrometric Data. Using the ratio λ of the semimajor axes of the photocenter to the primary orbits, the present paper develops an iterative fitting method. First, an init…

UBVRI Analysis of the Totally Eclipsing Extreme Mass Ratio W UMa Binary, GSC 3208 1986

Van Hamme, W.; Robb, Russell; Samec, R. G. +2 more

GSC 3208 1986 is an NSVS and TYCHO binary, first observed from 1999 to 2000. It is a W UMa binary with a period of 0.405 days. The present observations were taken in 2012 September and are of high precision, averaging a standard deviation of better than 5 mmag. The amplitude of the light curve is very nearly 0.5 mag yet it undergoes total eclipses…

The Identification of Extreme Asymptotic Giant Branch Stars and Red Supergiants in M33 With 24 µm Variability

Clayton, Geoffrey C.; Engelbracht, Charles W.; Srinivasan, Sundar +2 more

We present the first detection of 24 µm variability in 24 sources in the Local Group galaxy M33. These results are based on 4 epochs of Multiband Imaging Photometer for Spitzer observations, which are irregularly spaced over ∼ 750 days. We find that these sources are constrained exclusively to the Holmberg radius of the galaxy, which increas…

Application of Vector Spherical Harmonics and Kernel Regression to the Computations of OMM Parameters

Marco, F. J.; Martínez, M. J.; López, J. A.

The high quality of Hipparcos data in position, proper motion, and parallax has allowed for studies about stellar kinematics with the aim of achieving a better physical understanding of our galaxy, based on accurate calculus of the Ogorodnikov-Milne model (OMM) parameters. The use of discrete least squares is the most common adjustment method, but…

Structural Parameters for 10 Halo Globular Clusters in M33

Ma, Jun

In this paper, we present the properties of 10 halo globular clusters (GCs) with luminosities L ≃ 5-7 × 10⁵ L_⊙ in the Local Group galaxy M33 using images from the Hubble Space Telescope WFPC2 in the F555W and F814W bands. We obtained the ellipticities, position angles, and surface brightness profiles for each GC. In general, …

Near-Infrared Spectra of High-Albedo Outer Main-Belt Asteroids

Shirahata, Mai; Hasegawa, Sunao; Usui, Fumihiko +4 more

Most outer main-belt asteroids have low albedos because of their carbonaceouslike bodies. However, infrared satellite surveys have revealed that some asteroids have high albedos, which may suggest the presence of unusual surface minerals for those primitive objects. We present new near-infrared (1.1-2.5 µm) spectra of four outer main-belt as…

Erratum: “The Herschel Inventory of the Agents of Galaxy Evolution (Heritage) in the Magellanic Clouds, a Herschel Open Time Key Program” (2013, AJ, 146, 62)

Poglitsch, A.; van Loon, J. Th.; Bernard, J. -P. +52 more