Search Publications
Catalog of Planetary Nebulae Detected by GALEX and Corollary Optical Surveys
Bianchi, L.; Gómez-Muñoz, M. A.; Manchado, A.
Planetary nebulae (PNs) consist of an ionized envelope surrounding a hot central star (CSPN) that emits mostly at ultraviolet (UV) wavelengths. UV observations, therefore, provide important information on both the CSPN and the nebula. We have matched the PNs in the Hong Kong/Australian Astronomical Observatory/Strasbourg Hα catalog with the Galaxy…
HST Low-resolution Stellar Library
Gregg, Michael D.; Worthey, Guy; Silva, David R. +2 more
In order to provide fundamental stellar spectra that extend into the UV, Hubble Space Telescope's Space Telescope Imaging Spectrograph targeted 556 stars via proposals GO9088, GO9786, GO10222, and GO13776. Exposures through three low-resolution gratings provide wavelength coverage from 0.2 < λ < 1 µm at λ/Δλ ~ 1000. The UV grating (G23…
In the Trenches of the Solar-Stellar Connection. VII. Wilson-Bappu 2022
Ayres, Thomas
The Wilson-Bappu effect (WBE) is a remarkable correlation between the width of the chromospheric emission core of the Ca II 3934 Å K line and stellar absolute visual magnitude over an astonishing range, from diminutive red dwarfs to bloated yellow supergiants. The WBE signifies a deep connection between the nonclassical, mechanically heated chromo…
The COS Legacy Archive Spectroscopy Survey (CLASSY) Treasury Atlas
Ouchi, Masami; Kewley, Lisa J.; Ravindranath, Swara +46 more
Far-ultraviolet (FUV; ~1200-2000 Å) spectra are fundamental to our understanding of star-forming galaxies, providing a unique window on massive stellar populations, chemical evolution, feedback processes, and reionization. The launch of the James Webb Space Telescope will soon usher in a new era, pushing the UV spectroscopic frontier to higher red…
The Absolute Magnitude of the Sun in Several Filters
Willmer, Christopher N. A.
This paper presents a table with estimates of the absolute magnitude of the Sun and the conversions from vegamag to the AB and ST systems for several wide-band filters used in ground-based and space-based observatories. These estimates use the dustless spectral energy distribution (SED) of Vega, calibrated absolutely using the SED of Sirius, to se…
The UBV Color Evolution of Classical Novae. II. Color-Magnitude Diagram
Kato, Mariko; Hachisu, Izumi
We have examined the outburst tracks of 40 novae in the color-magnitude diagram (intrinsic B - V color versus absolute V magnitude). After reaching the optical maximum, each nova generally evolves toward blue from the upper right to the lower left and then turns back toward the right. The 40 tracks are categorized into one of six templates: very f…
A GALEX-based Search for the Sparse Young Stellar Population in the Taurus-Aurigae Star Forming Region
Gómez de Castro, Ana I.; López-Martínez, Fatima; Sánchez, Néstor +5 more
In this work, we identify 63 bona fide new candidates to T Tauri stars (TTSs) in the Taurus-Auriga region, using its ultraviolet excess as our baseline. The initial data set was defined from the GALEX all sky survey (AIS). The GALEX satellite obtained images in the near-ultraviolet (NUV) and far-ultraviolet (FUV) bands where TTSs show a prominent …
A Detailed Far-ultraviolet Spectral Atlas of O-type Stars
Smith, Myron A.
In this paper, we present a spectral atlas covering the wavelength interval 930-1188 Å for O2-O9.5 stars using Far-Ultraviolet Spectroscopic Explorer archival data. The stars selected for the atlas were drawn from three populations: Galactic main-sequence (classes III-V) stars, supergiants, and main-sequence stars in the Magellanic Clouds, which h…
Supermassive Black Hole Mass Estimates Using Sloan Digital Sky Survey Quasar Spectra at 0.7 < z < 2
Hall, Patrick B.; Rafiee, Alireza
We present Mg II-based black hole (BH) mass estimates for 27,602 quasars with rest-frame UV spectra available in the Sloan Digital Sky Survey Data Release Three. This estimation is possible due to the existence of an empirical correlation between the radius of the broad-line region (BLR) and the continuum luminosity at 3000 Å. We regenerate this c…
The Advanced Camera for Surveys+Wide Field Camera 3 Survey for Lyman Limit Systems. I. The Data
Prochaska, J. Xavier; Chen, Hsiao-Wen; Madau, Piero +1 more
We present a set of 71 quasars observed in the near ultraviolet with the PR200L prism on the Advanced Camera for Surveys and the G280 grism on the Wide Field Camera 3 (WFC3) on board the Hubble Space Telescope. The quasars were selected from the Sloan Digital Sky Survey data to search for intervening Lyman limit system (LLS) absorption. The sample…