- ID:
- ivo://CDS.VizieR/J/A+A/522/A54
- Title:
- Distance determination for RAVE stars. II.
- Short Name:
- J/A+A/522/A54
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- The RAdial Velocity Experiment (RAVE) is a spectroscopic survey of the Milky Way which already collected over 400000 spectra of ~330000 different stars. We use the subsample of spectra with spectroscopically determined values of stellar parameters to determine the distances to these stars. The list currently contains 235064 high quality spectra which show no peculiarities and belong to 210872 different stars. The numbers will grow as the RAVE survey progresses. The distances are determined with a method based on the work by Breddels et al. (2010, Cat. J/A+A/511/A90). Here we assume that the star undergoes a standard stellar evolution and that its spectrum shows no peculiarities. The refinements include: the use of either of the three isochrone sets, a better account of the stellar ages and masses, use of more realistic errors of stellar parameter values, and application to a larger dataset. The derived distances of both dwarfs and giants match within ~21% to the astrometric distances of Hipparcos stars and to the distances of observed members of open and globular clusters. Multiple observations of a fraction of RAVE stars show that repeatability of the derived distances is even better, with half of the objects showing a distance scatter of <=11%. RAVE dwarfs are ~300pc from the Sun, and giants are at distances of 1 to 2kpc, and up to 10kpc. This places the RAVE dataset between the more local Geneva-Copenhagen survey and the more distant and fainter SDSS sample. As such it is ideal to address some of the fundamental questions of Galactic structure and evolution in the pre-Gaia era. Individual applications are left to separate papers, here we show that the full 6-dimensional information on position and velocity is accurate enough to discuss the vertical structure and kinematic properties of the thin and thick disks.
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- ID:
- ivo://CDS.VizieR/J/A+A/432/851
- Title:
- Distance of 72 Galactic globular clusters
- Short Name:
- J/A+A/432/851
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- We present distance modulus and reddening determinations for 72 Galactic globular clusters from the homogeneous photometric database of Piotto et al. (2002, cat. <J/A+A/391/945>), calibrated to the HST flight F439W and F555W bands. The distances have been determined by comparison with theoretical absolute magnitudes of the ZAHB. For low and intermediate metallicity clusters, we have estimated the apparent Zero Age Horizontal Branch (ZAHB) magnitude from the RR Lyrae level. For metal rich clusters, the ZAHB magnitude was obtained from the fainter envelope of the red HB. Reddenings have been estimated by comparison of the HST colour-magnitude diagrams (CMD) with ground CMDs of template clusters with low reddening. The homogeneity of both the photometric data and the adopted methodological approach allowed us to obtain highly accurate relative cluster distances and reddenings. Our results are also compared with recent compilations in the literature. Description:
- ID:
- ivo://CDS.VizieR/J/A+A/646/A74
- Title:
- Distance of HiGAL sources
- Short Name:
- J/A+A/646/A74
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- Distances are key to determine the physical properties of sources. In the Galaxy, large (>10000) homogeneous samples of sources for which distance are available, covering the whole galactic distance range, are still missing. Here we present a catalog of velocity and distance for a large sample (>100000) of Hi-GAL compact sources. We develop a fully automatic Python-package to extract the velocity and determine the distance. To assign a velocity to a Hi-GAL compact source, the code uses all the available spectroscopic data complemented by a morphological analysis. Once the velocity is determined, if no stellar or maser parallax distance is known, the kinematic distance is calculated and the distance ambiguity (for sources located inner the Solar circle) is solved with the HII self-absorption method or from distance-extinction data. Among the 150223 compact sources of the Hi-GAL catalog, we obtained a distance for for 124069 sources for the 5-sigma catalog (and 128351 sources for the 3-sigma catalog), where sigma represents the noise level of each molecular spectrum used for the lines detection made at 5-sigma and 3-sigma, to produce the respective catalog.
- ID:
- ivo://CDS.VizieR/J/A+A/550/A125
- Title:
- Distances and kinematics with CoRoT stars
- Short Name:
- J/A+A/550/A125
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- We use kinematical and chemical properties of 754 CoRoT stars to characterise the stellar populations of the Milky Way disc in three beams close the Galactic plane. From the atmospheric parameters derived in Gazzano et al. (2010, Cat. J/A+A/523/A91) with the MATISSE algorithm, we derived stellar distances using isochrones. Combining these data with proper motions, we provide the complete kinematical description of stars in three CoRoT fields. Finally, we used kinematical criteria to identify the Galactic populations in our sample and study their characteristics, particularly their chemistry.
- ID:
- ivo://CDS.VizieR/J/ApJS/136/463
- Title:
- Distances and metallicities of HVCs and IVCs
- Short Name:
- J/ApJS/136/463
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- A table is presented that summarizes published absorption line measurements for the high- and intermediate-velocity clouds (HVCs and IVCs). New values are derived for N(HI) in the direction of observed probes, in order to arrive at reliable abundances and abundance limits (the HI data are described in Paper II, Wakker et al., 2001ApJS..136..537W). Distances to stellar probes are revisited and calculated consistently, in order to derive distance brackets or limits for many of the clouds, taking care to properly interpret nondetections.
- ID:
- ivo://CDS.VizieR/J/ApJS/256/46
- Title:
- Distances & color excesses of high gal. mol. clouds
- Short Name:
- J/ApJS/256/46
- Date:
- 03 Mar 2022 14:08:03
- Publisher:
- CDS
- Description:
- Based on the accurate color excess E_GBP,GRP_ of more than 4 million stars and the E_NUV,GBP_ of more than 1 million stars from Paper I (Sun+, 2021ApJS..254...38S), the distance and extinction of the molecular clouds (MCs) in the Magnani-Blitz-Mundy (MBM; 1985ApJ...295..402M) catalog at |b|>20{deg} are studied in combination with the distance measurement of Gaia/EDR3. The distance, as well as the color excess, is determined for 66 MCs. The color excess ratio E_NUV,GBP_/E_GBP,GRP_ is derived for 39 of them, which is obviously larger and implies more small particles at smaller extinction. In addition, the scale height of the dust disk is found to be about 100 pc and becomes large at the anticenter direction due to the disk flaring.
- ID:
- ivo://CDS.VizieR/J/MNRAS/422/3178
- Title:
- Distances of 793 BGPS sources
- Short Name:
- J/MNRAS/422/3178
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- By positional matching to the catalogue of Galactic Ring Survey molecular clouds, we have derived distances to 793 Bolocam Galactic Plane Survey (BGPS) sources out of a possible 806 located within the region defined by Galactic longitudes l=28.5{deg}-31.5{deg} and latitudes |b|<=1{deg}. This section of the Galactic plane contains several major features of Galactic structure at different distances, mainly mid-arm sections of the Perseus and Sagittarius spiral arms and the tangent of the Scutum-Centaurus arm, which is coincident with the end of the Galactic long bar. By utilizing the catalogued cloud distances plus new kinematic distance determinations, we are able to separate the dense BGPS clumps into these three main line-of-sight components to look for variations in star formation properties that might be related to the different Galactic environments. We find no evidence of any difference in either the clump mass function or the average clump formation efficiency (CFE) between these components that might be attributed to environmental effects on scales comparable to Galactic structure features.
- ID:
- ivo://CDS.VizieR/J/AJ/136/2107
- Title:
- Distances of cataclysmic variables
- Short Name:
- J/AJ/136/2107
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- We report parallax and distance estimates for 12 more cataclysmic binaries and related objects observed with the 2.4m Hiltner telescope at MDM Observatory. The final parallax accuracy is typically ~1mas.
- ID:
- ivo://CDS.VizieR/J/AJ/126/3017
- Title:
- Distances of Cataclysmic variables
- Short Name:
- J/AJ/126/3017
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- The 2.4m Hiltner Telescope at MDM Observatory was used in an attempt to measure trigonometric parallaxes for 14 cataclysmic variable stars. Techniques are described in detail. In the best cases the parallax uncertainties are below 1mas, and significant parallaxes are found for most of the program stars. A Bayesian method that combines the parallaxes together with proper motions and absolute magnitude constraints is developed and used to derive distance estimates and confidence intervals. The most precise distance derived here is for WZ Sge, for which is found to be 43.3^+1.6^_-1.5_pc. Six Luyten Half-Second stars with previous precise parallax measurements were remeasured to test the techniques, and good agreement was found.
- ID:
- ivo://CDS.VizieR/J/ApJ/833/119
- Title:
- Distances of Gaia DR1 TGAS sources
- Short Name:
- J/ApJ/833/119
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- We infer distances and their asymmetric uncertainties for two million stars using the parallaxes published in the Gaia DR1 (GDR1) catalogue. We do this with two distance priors: A minimalist, isotropic prior assuming an exponentially decreasing space density with increasing distance, and an anisotropic prior derived from the observability of stars in a Milky Way model. We validate our results by comparing our distance estimates for 105 Cepheids which have more precise, independently estimated distances. For this sample we find that the Milky Way prior performs better (the RMS of the scaled residuals is 0.40) than the exponentially decreasing space density prior (RMS is 0.57), although for distances beyond 2kpc the Milky Way prior performs worse, with a bias in the scaled residuals of -0.36 (vs. -0.07 for the exponentially decreasing space density prior). We do not attempt to include the photometric data in GDR1 due to the lack of reliable colour information. Our distance catalogue is available at http://www.mpia.de/homes/calj/tgas_distances/main.html. These should only be used to give individual distances. Combining data or testing models should be done with the original parallaxes, and attention paid to correlated and systematic uncertainties.
