- ID:
- ivo://CDS.VizieR/J/MNRAS/396/2295
- Title:
- Stellar cluster dynamical masses in NGC2903
- Short Name:
- J/MNRAS/396/2295
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- Gas and star velocity dispersions have been derived for four circumnuclear star-forming regions (CNSFRs) and the nucleus of the spiral galaxy NGC 2903 using high-resolution spectroscopy in the blue and far red. Stellar velocity dispersions have been obtained from the CaII triplet lines at {lambda}{lambda} 8494, 8542, 8662{AA}, using cross-correlation techniques, while gas velocity dispersions have been measured by Gaussian fits to the H{beta} {lambda} 4861{AA} line.
Number of results to display per page
Search Results
- ID:
- ivo://CDS.VizieR/J/A+A/542/A3
- Title:
- Stellar clusters from UKIDSS Galactic Plane Survey
- Short Name:
- J/A+A/542/A3
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- Data mining techniques must be developed and applied to analyse the large public data bases containing hundreds to thousands of millions entries. We develop methods for locating previously unknown stellar clusters from the UKIDSS Galactic Plane Survey (GPS) catalogue data.
- ID:
- ivo://CDS.VizieR/J/AJ/138/227
- Title:
- Stellar clusters in NGC 6334 complex
- Short Name:
- J/AJ/138/227
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- The full stellar population of NGC 6334, one of the most spectacular regions of massive star formation in the nearby Galaxy, has not been well sampled in past studies. We analyze here a mosaic of two Chandra X-ray Observatory images of the region using sensitive data analysis methods, giving a list of 1607 faint X-ray sources with arcsecond positions and approximate line-of-sight absorption. About 95% of these are expected to be cluster members, most lower mass pre-main-sequence stars. Extrapolating to low X-ray levels, the total stellar population is estimated to be 20,000-30,000 pre-main-sequence stars.
- ID:
- ivo://CDS.VizieR/J/AN/341/996
- Title:
- Stellar companions of (C)TOIs
- Short Name:
- J/AN/341/996
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- The first results of a new survey are reported, which explores the 2nd data release of the ESA-Gaia mission, in order to search for stellar companions of (Community) TESS Objects of Interest and to characterize their properties. In total, 193 binary and 15 hierarchical triple star systems are presented, detected among 1391 target stars, which are located at distances closer than about 500pc around the Sun. The companions and the targets are equidistant and share a common proper motion, as it is expected for gravitationally bound stellar systems, proven with their accurate Gaia astrometry. The companions exhibit masses in the range between about 0.08M_{sun}_ and 3M_{sun}_ and are most frequently found in the mass range between 0.13 and 0.6M_{sun}_. The companions are separated from the targets by about 40 up to 9900au, and their frequency continually decreases with increasing separation. While most of the detected companions are late K to mid M dwarfs, also 5 white dwarf companions were identified in this survey, whose true nature is revealed by their photometric properties.
- ID:
- ivo://CDS.VizieR/J/AN/342/840
- Title:
- Stellar companions of (C)TOIs
- Short Name:
- J/AN/342/840
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- We present the latest results of our ongoing multiplicity study of (Community) TESS Objects of Interest, using astro- and photometric data from the ESA-Gaia mission, to detect stellar companions of these stars and to characterize their properties. In total, 107 binary, 5 hierarchical triple star systems, as well as one quadruple system were detected among 585 targets surveyed, which are all located at distances closer than about 500pc around the Sun. As proven with their accurate Gaia EDR3 astrometry, the companions and the targets are located at the same distance and share a common proper motion, as it is expected for components of gravitationally bound stellar systems. The companions exhibit masses in the range between about 0.09M_{sun}_ and 4.5M_{sun}_ and are most frequently found in the mass range between 0.15 and 0.6M_{sun}_. The companions are separated from the targets by about 120 up to 9500au and their frequency is the highest and constant within about 500au while it continually decreases for larger separations. Beside mainly early to mid M dwarfs, also 5 white dwarf companions were identified in this survey, whose true nature was revealed by their photometric properties.
- ID:
- ivo://CDS.VizieR/J/MNRAS/490/5088
- Title:
- Stellar companions of exoplanet host stars
- Short Name:
- J/MNRAS/490/5088
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- A new survey is presented, which explores the second data release of the ESA-Gaia mission, in order to search for stellar companions of exoplanet host stars, located at distances closer than about 500pc around the Sun. In total, 176 binaries, 27 hierarchical triples, and one hierarchical quadruple system are detected among more than 1300 exoplanet host stars, whose multiplicity is investigated, yielding a multiplicity rate of the exoplanet host stars of at least about 15 per cent. The detected companions and the exoplanet host stars are equidistant and share a common proper motion, as it is expected for gravitationally bound stellar systems, proven with their accurate Gaia astrometry. The companions exhibit masses in the range between about 0.078 and 1.4M_{sun}_ with a peak in their mass distribution between 0.15 and 0.3M{sun}_. The companions are separated from the exoplanet host stars by about 20 up to 9100au, but are found most frequently within a projected separation of 1000au. While most of the detected companions are early M dwarfs, eight white dwarf companions of exoplanet host stars are also identified in this survey, whose true nature is revealed with their photometric properties. Hence, these degenerated companions and the exoplanet host stars form evolved stellar systems with exoplanets, which have survived (physically but also dynamically) the post-main-sequence evolution of their former primary star.
- ID:
- ivo://CDS.VizieR/J/MNRAS/421/2498
- Title:
- Stellar companions of exoplanet host stars
- Short Name:
- J/MNRAS/421/2498
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- To understand the influence of additional wide stellar companions on planet formation, it is necessary to determine the fraction of multiple stellar systems amongst the known extrasolar planet population. We target recently discovered radial velocity exoplanetary systems observable from the Northern hemisphere and with sufficiently high proper motion to detect stellar companions via direct imaging. We utilize the Calar Alto 2.2-m telescope in combination with its lucky imaging camera AstraLux. 71 planet host stars have been observed so far, yielding one new low-mass (0.239+/-0.022M_{sun}_) stellar companion, 4.5-arcsec (227 au of projected separation) north-east of the planet host star HD 185269, detected via astrometry with AstraLux. We also present follow-up astrometry on three previously discovered stellar companions, showing for the first time common proper motion of the 0.5-arcsec companion to HD 126614. Additionally, we determined the achieved detection limits for all targets, which allow us to characterize the detection space of possible further companions of these stars.
- ID:
- ivo://CDS.VizieR/II/95
- Title:
- Stellar Component of the Galaxy, AFGL IR Survey
- Short Name:
- II/95
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- Measurements at 2.3, 3.6, 4.9, 8.7, 10, 11.4, 12.6, 19, and 23 {mu}m are included in this catalog based on observations by the Wyoming Infrared Observatory. The sources included are those from the AFGL survey with the 4mu magnitude brighter than +1.3, the 11mu magnitude brighter than -1.5, or the 20mu magnitude brighter than -4, which lie between 20 and 40 minutes in each hour of right ascension.
- ID:
- ivo://CDS.VizieR/J/MNRAS/310/210
- Title:
- Stellar composition of CMa R1
- Short Name:
- J/MNRAS/310/210
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- This directory contains movies in mpeg format which show models for the time evolution of the Hertzsprung-Russell diagram of a very young open cluster between 0 and 30Myr. Four different star formation scenario's are considered, (a) instantaneous star formation, (b) constant rate of star formation with time, (c) increasing rate of star formation, and (d) decreasing rate of star formation. For the latter three scenario's, models for a duration of the star formation episode {delta}t of 0.1, 1.0 and 10Myr are computed.
- ID:
- ivo://CDS.VizieR/J/AJ/103/1205
- Title:
- Stellar Content of LH 9 and 10 in the LMC
- Short Name:
- J/AJ/103/1205
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- We present CCD photometry and spectroscopy for stars in Lucke-Hodge 9 and 10, two adjacent OB association in the northwest corner of the LMC. Our catalog contains UBV photometry (complete to ~18mag in all three filters) for 795 stars and BV-only photometry (complete to ~19mag in both filters) for an additional 434 stars.