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62. RC3 ConeSearch
- ID:
- ivo://archive.stsci.edu/catalogs/RC3
- Title:
- RC3 ConeSearch
- Short Name:
- RC3 CS
- Date:
- 13 Feb 2020 17:38:51
- Publisher:
- Space Telescope Science Institute Archive
- Description:
- All MAST catalog holdings are available via a ConeSearch endpoint. The Third Reference Catalog of Bright Galaxies (RC3) by G. and A. de Vaucouleurs, H.G. Corwin, R.J. Buta, G. Paturel, and P. Fouque. is included as held in a MAST local copy. All available missions are listed at http://archive.stsci.edu/vo/mast_services.html.
- ID:
- ivo://CDS.VizieR/J/A+A/568/L12
- Title:
- Rotational frequency splitting in Sun-like stars
- Short Name:
- J/A+A/568/L12
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- Asteroseismology offers the prospect of constraining differential rotation in Sun-like stars. Here we have identified six high signal-to-noise main-sequence Sun-like stars in the Kepler field, which all have visible signs of rotational splitting of their p-mode frequencies. For each star, we extract the rotational frequency splitting and inclination angle from separate mode sets (adjacent modes with l=2, 0, and 1) spanning the p-mode envelope. We use a Markov chain Monte Carlo method to obtain the best fit and errors associated with each parameter. We are able to make independent measurements of rotational splittings of ~8 radial orders for each star. For all six stars, the measured splittings are consistent with uniform rotation, allowing us to exclude large radial differential rotation. This work opens the possibility of constraining internal rotation of Sun-like stars.
64. SDSS ConeSearch
- ID:
- ivo://archive.stsci.edu/catalogs/SDSS
- Title:
- SDSS ConeSearch
- Short Name:
- SDSS CS
- Date:
- 13 Feb 2020 17:40:32
- Publisher:
- Space Telescope Science Institute Archive
- Description:
- All MAST catalog holdings are available via a ConeSearch endpoint. The Sloan Digital Sky Survey (SDSS) Data Release 12 (SDSS DR12) contains all SDSS observations through July 2014. The STScI mirror is available here. More information on SDSS and this data release are available at http://www.sdss.org/dr12/. All available missions are listed at http://archive.stsci.edu/vo/mast_services.html.
- ID:
- ivo://archive.stsci.edu/hst/stis
- Title:
- Space Telescope Imaging Spectrograph
- Short Name:
- HST.STIS
- Date:
- 23 Jul 2020 19:50:49
- Publisher:
- Space Telescope Science Institute Archive
- Description:
- The Space Telescope Imaging Spectrograph (STIS) was installed in HST on Feb. 14, 1997, replacing the GHRS spectrograph. STIS provides spectra and images at ultraviolet and visible wavelengths, probing the Universe from our solar system out to cosmological distances.
- ID:
- ivo://CDS.VizieR/J/A+A/622/A85
- Title:
- Starspot rotation rates vs. activity cycle phase
- Short Name:
- J/A+A/622/A85
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- During the solar magnetic activity cycle the emergence latitudes of sunspots change, leading to the well-known butterfly diagram. This phenomenon is poorly understood for other stars since starspot latitudes are generally unknown. The related changes in starspot rotation rates caused by latitudinal differential rotation can however be measured. Using the set of 3093 Kepler stars with activity cycles identified by Reinhold et al. (2017A&A...603A..52R, Cat. J/A+A/603/A52), we aim to study the temporal change in starspot rotation rates over magnetic activity cycles, and how this relates to the activity level, the mean rotation rate of the star, and its effective temperature. We measured the photometric variability as a proxy for the magnetic activity and the spot rotation rate in each quarter over the duration of the Kepler mission. We phase-fold these measurements with the cycle period. To reduce random errors we perform averages over stars with comparable mean rotation rates and effective temperature at fixed activity-cycle phases. We detect a clear correlation between the variation of activity level and the variation of the starspot rotation rate. The sign and amplitude of this correlation depends on the mean stellar rotation and -- to a lesser extent -- on the effective temperature. For slowly rotating stars (rotation periods between 15-28 days) the starspot rotation rates are clearly anti-correlated with the level of activity during the activity cycles. A transition is observed around rotation periods of 10-15 days, where stars with effective temperature above 4200K instead show positive correlation. Our measurements can be interpreted in terms of a stellar "butterfly diagram", but these appear different from the Sun's since the starspot rotation rates are either in phase or anti-phase with the activity level. Alternatively, the activity cycle periods observed by Kepler are short (around 2.5 years) and may therefore be secondary cycles, perhaps analogous to the solar quasi-biennial oscillations.
- ID:
- ivo://CDS.VizieR/B/swift
- Title:
- Swift Master Catalog
- Short Name:
- B/swift
- Date:
- 20 Mar 2022 06:12:03
- Publisher:
- CDS
- Description:
- (no description available)
- ID:
- ivo://archive.stsci.edu/catalogs/TESSINPUT
- Title:
- TESS Input Catalog ConeSearch
- Short Name:
- TIC CS
- Date:
- 06 May 2024 13:23:15
- Publisher:
- Space Telescope Science Institute Archive
- Description:
- The TESS Input Catalog is a comprehensive collection of 1.73 billion sources on the sky, providing stellar parameters for evaluation of potential planetary transit signals. It combines sources from many other catalogs, including 2MASS, LAMOST, SuperBlink, HSOY, RAVE, APOGEE, UCAC, KIC, EPIC, Tycho-2, APASS, AllWISE, SDSS, Gaia DR2, and Hipparcos. It was constructed for the TESS mission to serve as a source for selecting targets to observe with the TESS two-minute cadence, and to provide stellar parameter information for evaluating the properties of transit candidates. MAST catalog holdings are available via Cone Search endpoints. All available missions are listed at http://archive.stsci.edu/vo/mast_services.html. This service provides access to the TESS input catalog (TIC), currently version 8.2.
- ID:
- ivo://archive.stsci.edu/catalogs/atlas
- Title:
- The ATLAS All-Sky Stellar Reference Catalog ConeSearch
- Short Name:
- ATLAS CS
- Date:
- 13 Feb 2020 17:09:38
- Publisher:
- Space Telescope Science Institute Archive
- Description:
- All MAST catalog holdings are available via Cone Search endpoints. This service provides access to the ATLAS All-Sky Stellar Reference Catalog. The Asteroid Terrestrial-impact Last Alert System (ATLAS) observes most of the sky every night in search of dangerous asteroids. Its data are also used to search for photometric variability, where sensitivity to variability is limited by photometric accuracy. Since each exposure spans 7.6 deg corner to corner, variations in atmospheric transparency in excess of 0.01 mag are common, and 0.01 mag photometry cannot be achieved by using a constant flat field calibration image. We therefore have assembled an all-sky reference catalog of approximately one billion stars to m~19 from a variety of sources to calibrate each exposure's astrometry and photometry. Gaia DR2 is the source of astrometry for this ATLAS Refcat2. The sources of g, r, i, z photometry include Pan-STARRS DR1, the ATLAS Pathfinder photometry project, ATLAS re-flattened APASS data, SkyMapper DR1, APASS DR9, the Tycho-2 catalog, and the Yale Bright Star Catalog. We have attempted to make this catalog at least 99% complete to m less than 19, including the brightest stars in the sky. We believe that the systematic errors are no larger than 5 millimag RMS, although errors are as large as 20 millimag in small patches near the galactic plane. All available missions are listed at http://archive.stsci.edu/vo/mast_services.html.
- ID:
- ivo://CDS.VizieR/B/chandra
- Title:
- The Chandra Archive Log
- Short Name:
- B/chandra
- Date:
- 07 Mar 2022 06:17:49
- Publisher:
- CDS
- Description:
- The Chandra X-Ray Observatory (CXO) is a high-resolution (< 0.5 arcsecond) X-ray telescope with a suite of advanced imaging and spectroscopic instruments. The Observatory was successfully launched by NASA's Space Shuttle Columbia on July 23, 1999. Chandra was designed to provide order-of-magnitude advances over previous X-ray astronomy missions with regards to spatial and spectral resolution. The High Resolution Mirror Assembly (HRMA) produces images with a half-power diameter (HPD) of the point spread function (PSF) of < 0.5 arcsec. Chandra has two focal plane science instruments, i) The Advanced CCD Imaging Spectrometer (ACIS), and ii) The High Resolution Camera (HRC). ACIS is comprised of two CCD arrays, a 4-chip array, ACIS-I ; and a 6-chip array, ACIS-S . ACIS-I was designed for CCD imaging and spectrometry; ACIS-S can be used both for CCD imaging spectrometry and also for high-resolution spectroscopy in conjunction with the HETG grating. A mix of ACIS-S and ACIS-I chips (up to six) may be used for imaging observations. The HRC is comprised of two microchannel plate (MCP ) imaging detectors: the HRC-I designed for wide-field imaging; and, HRC-S designed to serve as a readout for the LETG . The grating systems consist of the Low Energy Transmission Grating (LETG) and the High Energy Transmission Grating (HETG). The HETG , when operated with the HRMA and the ACIS-S , forms the High-Energy Transmission Grating Spectrometer (HETGS ) for high resolution spectroscopy . The HETGS achieves resolving power up to 1000 in the band between 0.4 keV and 10.0 keV. The LETG when operated with the HRC-S , forms the Low Energy Transmission Grating Spectrometer (LETGS ). The LETGS provides the highest spectral resolution on Chandra at low (0.08 - 0.2 keV) energies. This catalogue is a copy of the Chandra Observation Catalog from the Chandra Data Archive (CDA) which is part of the Chandra X-Ray Observatory Science Center (CXC) which is operated for NASA by the Smithsonian Astrophysical Observatory.
