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Mass-to-light Ratios of Spatially Resolved Stellar Populations in M31
Bell, Eric F.; Dolphin, Andrew E.; Williams, Benjamin F. +4 more
A galaxy's stellar mass-to-light ratio (M_{\star }/L) is a useful tool for converting luminosity to stellar mass (M_{\star }). However, the practical utility of M_{\star}/L inferred from stellar population synthesis (SPS) models is limited by mismatches between the real and assumed models for star-formation history (SFH) and dust geometry, both of…
Discovery of a pre-cataclysmic binary with unusual chromaticity of the eclipsed white dwarf by the GPX survey
Barkaoui, Khalid; Gillon, Michaël; Jehin, Emmanuël +14 more
We report the discovery of a relatively bright eclipsing binary system, which consists of a white dwarf (WD) and a main-sequence K7 star with clear signs of chromospheric and spot activity. The light curve of this system shows ∼0.2 mag ellipsoidal variability with a period of 0.297549 d and a short total eclipse of the WD. Based on our analysis of…
DY Pegasi: An SX Phoenicis Star in a Binary System with an Evolved Companion
Xue, Hui-Fang; Niu, Jia-Shu
In this work, the photometric data from the American Association of Variable Star Observers are collected and analyzed on the SX Phoenicis star DY Pegasi (DY Peg). From the frequency analysis, we get three independent frequencies: f0 = 13.71249 c d-1, f1 = 17.7000 c d-1, and f2 = 18.138 c d
Possible Transient Luminous Events Observed in Jupiter's Upper Atmosphere
Wong, Michael H.; Gérard, Jean-Claude; Kammer, Joshua A. +10 more
Eleven transient bright flashes were detected in Jupiter's atmosphere using the ultraviolet spectrograph instrument on the Juno spacecraft. These bright flashes are only observed in a single spin of the spacecraft and their brightness decays exponentially with time, with a duration of ∼1.4 ms. The spectra are dominated by H2 Lyman band …
BRITE-Constellation photometry of π5 Orionis, an ellipsoidal SPB variable
Handler, G.; Wade, G. A.; Pigulski, A. +5 more
Results of an analysis of the BRITE-Constellation photometry of the SB1 system and ellipsoidal variable π5 Ori (B2 III) are presented. In addition to the orbital light-variation, which can be represented as a five-term Fourier cosine series with the frequencies forb, 2forb, 3forb, 4forb, and 6…
Stellar coronal X-ray emission and surface magnetic flux
Peter, H.; Zhuleku, J.; Warnecke, J.
Context. Observations show that the coronal X-ray emission of the Sun and other stars depends on the surface magnetic field.
Aims: Using power-law scaling relations between different physical parameters, we aim to build an analytical model to connect the observed X-ray emission to the surface magnetic flux.
Methods: The basis for our mod…
The NGC 346 massive star census. Nitrogen abundances for apparently single, narrow lined, hydrogen core burning B-type stars
Dufton, P. L.; Lennon, D. J.; Evans, C. J. +1 more
Previous analyses of two large spectroscopic surveys of early-type stars in the Large Magellanic Cloud (LMC) have found an excess of nitrogen enriched B-type targets with a ve sin i ≤ 40 km s-1 compared with the predictions of single star evolutionary models that incorporate rotational mixing. By contrast, the number of such …
Low-activity Main-belt Comet 133P/Elst-Pizarro: New Constraints on Its Albedo, Temperature, and Active Mechanism from a Thermophysical Perspective
Ip, Wing-Huen; Hsia, Chih Hao; Yu, Liang Liang
133P/Elst-Pizarro is the first recognized main-belt comet, but we still know little about its nucleus. First we use mid-infrared data of Spitzer MIPS, Spitzer IRS, and the Wide-field Infrared Survey Explorer to estimate its effective diameter, ${D}_{\mathrm{eff}}={3.9}_{-0.3}^{+0.4}$ km, geometric albedo, ${p}_{{\rm{v}}}=0.074\pm 0.013$ , and mean…
Fermi-LAT Observations of V549 Vel 2017: A Subluminous Gamma-Ray Nova?
Strader, Jay; Chomiuk, Laura; Munari, Ulisse +4 more
We report on the Fermi Large Area Telescope detection (with ≈5.7σ significance) as well as the multiwavelength analysis of the 2017 nova eruption V549 Vel. Unlike the recent shock-powered novae ASASSN-16ma and V906 Car, the optical and γ-ray light curves of V549 Vel show no correlation, likely implying relatively weak shocks in the eruption. Gaia …
The Star Formation Rate-Radius Connection: Data and Implications for Wind Strength and Halo Concentration
Barro, Guillermo; Ferguson, Henry C.; Grogin, Norman A. +26 more
This paper is one in a series that explores the importance of radius as a second parameter in galaxy evolution. The topic investigated here is the relationship between star formation rate (SFR) and galaxy radius ( ${R}_{{\rm{e}}}$ ) for main-sequence star-forming galaxies. The key observational result is that, over a wide range of stellar mass and…