Search Publications
Analysis of Membership Probability in Nearby Young Moving Groups with Gaia DR2
Mathew, Blesson; Manoj, P.; Ujjwal, K. +2 more
We analyze the membership probability of young stars belonging to nearby moving groups with Gaia DR2 data. The sample of 1429 stars was identified from "The Catalog of Suspected Nearby Young Moving Group Stars." Good-quality parallax and proper motion values were retrieved for 890 stars from the Gaia DR2 database. The analysis for membership proba…
An Updated Small Magellanic Cloud and Magellanic Bridge Catalog of Star Clusters, Associations, and Related Objects
Barbuy, Beatriz; Bica, Eduardo; Santos, João F. C., Jr. +5 more
We present a catalog of star clusters, associations, and related extended objects in the Small Magellanic Cloud (SMC) and the Magellanic Bridge with 2741 entries, a factor 2 more than a previous version from a decade ago. Literature data up until 2018 December are included. The identification of star clusters was carried out with digital atlases i…
Gaia 18dvy: A New FUor in the Cygnus OB3 Association
Gromadzki, M.; Szabados, L.; Mugrauer, M. +60 more
We present optical-infrared photometric and spectroscopic observations of Gaia 18dvy, located in the Cygnus OB3 association at a distance of 1.88 kpc. Gaia 18dvy was noted by the Gaia alerts system when its light curve exhibited a ≳4 mag rise in 2018-2019. The brightening was also observable at mid-infared wavelengths. The infrared colors of Gaia …
The Cepheid Distance to the Seyfert 1 Galaxy NGC 4151
Ferrarese, L.; Vestergaard, M.; Peterson, B. M. +15 more
We derive a distance of 15.8 ± 0.4 Mpc to the archetypal Seyfert 1 galaxy NGC 4151 based on the near-infrared Cepheid period-luminosity relation and new Hubble Space Telescope multiband imaging. This distance determination, based on measurements of 35 long-period (P > 25 days) Cepheids, will support the absolute calibration of the supermassive …
Properties of M Dwarf Flares at Millimeter Wavelengths
Hughes, A. Meredith; Osten, Rachel A.; MacGregor, A. Meredith
We report on two millimeter flares detected by the Atacama Large Millimeter/submillimeter Array at 220 GHz from AU Mic, a nearby M dwarf. The larger flare had a duration of only ∼35 s, with peak LR = 2 × 1015 erg s-1 Hz-1, and lower limit on linear polarization of | Q/I| > 0.12 ± 0.04. We examine the …
TOI-503: The First Known Brown-dwarf Am-star Binary from the TESS Mission
Barclay, Thomas; Latham, David W.; Quinn, Samuel N. +78 more
We report the discovery of an intermediate-mass transiting brown dwarf (BD), TOI-503b, from the TESS mission. TOI-503b is the first BD discovered by TESS, and it has circular orbit around a metallic-line A-type star with a period of P = 3.6772 ± 0.0001 days. The light curve from TESS indicates that TOI-503b transits its host star in a grazing mann…
Resolving the FU Orionis System with ALMA: Interacting Twin Disks?
Liu, Hauyu Baobab; Williams, Jonathan; Zhu, Zhaohuan +7 more
FU Orionis objects are low-mass pre-main sequence stars characterized by dramatic outbursts several magnitudes in brightness. These outbursts are linked to episodic accretion events in which stars gain a significant portion of their mass. The physical processes behind these accretion events are not yet well understood. The archetypal FU Ori system…
Multiwavelength Follow-up of the Hyperluminous Intermediate-mass Black Hole Candidate 3XMM J215022.4-055108
Romanowsky, Aaron J.; Remillard, Ronald A.; Strader, Jay +6 more
We recently discovered the X-ray/optical outbursting source 3XMM J215022.4-055108. It was best explained as the tidal disruption of a star by an intermediate-mass black hole of mass of a few tens of thousand solar masses in a massive star cluster at the outskirts of a large barred lenticular galaxy at DL = 247 Mpc. However, we could not…
Lupus DANCe. Census of stars and 6D structure with Gaia-DR2 data
Bertin, E.; Miret-Roig, N.; Bouy, H. +8 more
Context. Lupus is recognised as one of the closest star-forming regions, but the lack of trigonometric parallaxes in the pre-Gaia era hampered many studies on the kinematic properties of this region and led to incomplete censuses of its stellar population.
Aims: We use the second data release of the Gaia space mission combined with published …
Exploring the Stellar Age Distribution of the Milky Way Bulge Using APOGEE
Cohen, Roger E.; Cunha, Katia; Smith, Verne V. +20 more
We present stellar age distributions of the Milky Way bulge region using ages for ∼6000 high-luminosity ( $\mathrm{log}(g)\lt 2.0$ ), metal-rich ([Fe/H] ≥ -0.5) bulge stars observed by the Apache Point Observatory Galactic Evolution Experiment. Ages are derived using The Cannon label-transfer method, trained on a sample of nearby luminous giants w…