- ID:
- ivo://CDS.VizieR/J/A+A/504/291
- Title:
- Candidate Planetary Nebulae in IPHAS catalog
- Short Name:
- J/A+A/504/291
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- We have carried out a semi-automated search for planetary nebulae (PNe) in the INT Photometric H-Alpha Survey (IPHAS) catalogue. We present the PN search and the list of selected candidates. We cross correlate the selected candidates with a number of existing infrared galactic surveys in order to gain further insight into the nature of the candidates. Spectroscopy of a subset of objects is used to estimate the number of PNe present in the entire candidate list. The overall aim of the IPHAS PN project is to carry out a deep census of PNe in the northern Galactic plane, an area where PN detections are clearly lacking. The PN search is carried out on the IPHAS photometric catalogues. The candidate selection is based on the IPHAS and 2MASS/UKIDSS colours of the objects and the final candidate selection is made visually.
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Search Results
- ID:
- ivo://CDS.VizieR/J/other/KFNT/23.102
- Title:
- Candidate Red Clump stars in the Tycho-2
- Short Name:
- J/other/KFNT/23.
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- We present the catalogue of 60910 local stars brighter than Ks=8.2mag, which were assigned to be the most probable Red Clump candidates from Ks-band reduced proper motions. The catalogue is the result of analysis of combined Tycho-2 and 2MASS data selected in (J-Ks) interval from 0.5 to 0.8mag. It includes Tycho-2, Hipparcos and 2MASS numbers, equatorial coordinates J2000.0, proper motions and their standard errors, Tycho-2 B and V magnitudes, 2MASS J, H, Ks magnitudes, and Red Clump probabilities. All astrometric data were extracted from the Tycho-2 main catalogue; photometric data were extracted from the Tycho-2 and 2MASS catalogues. Red Clump probabilities were calculated by means of maximum-likelihood method based on Ks-band reduced proper motions. The catalogue provides data listed in order of right ascension increasing. About 85% of the sample stars are proved may be actual Red Clump giants as resulted from both Ks-band absolute magnitude analysis and the MK spectral classification.
- ID:
- ivo://CDS.VizieR/J/A+A/571/A43
- Title:
- Candidate red supergiants in Galactic clusters
- Short Name:
- J/A+A/571/A43
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- Clear identifications of Galactic young stellar clusters farther than a few kpc from the Sun are rare, despite the large number of candidate clusters. We aim to improve the selection of candidate clusters rich in massive stars with a multiwavelength analysis of photometric Galactic data that range from optical to mid-infrared wavelengths. We present a photometric and spectroscopic analysis of five candidate stellar clusters, which were selected as overdensities with bright stars (K_s_<7mag) in GLIMPSE and 2MASS images. A total of 48 infrared spectra were obtained. The combination of photometry and spectroscopy yielded six new red supergiant stars with masses from 10M_{sun}_ to 15M_{sun}_. Two red supergiants are located at Galactic coordinates (l,b)=(16.7{deg}, -0.63{deg}) and at a distance of about ~3.9kpc; four other red supergiants are members of a cluster at Galactic coordinates (l,b)=(49.3{deg}, +0.72{deg}) and at a distance of ~7.0kpc. Spectroscopic analysis of the brightest stars of detected overdensities and studies of interstellar extinction along their line of sights are fundamental to distinguish regions of low extinction from actual stellar clusters. The census of young star clusters containing red supergiants is incomplete; in the existing all-sky near-infrared surveys, they can be identified as overdensities of bright stars with infrared color-magnitude diagrams characterized by gaps.
- ID:
- ivo://CDS.VizieR/J/ApJ/833/281
- Title:
- Candidate rotating M dwarfs from PS1-MDS
- Short Name:
- J/ApJ/833/281
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- We report on an ongoing project to investigate activity in the M dwarf stellar population observed by the Pan-STARRS1 Medium-Deep Survey (PS1-MDS). Using a custom-built pipeline, we refine an initial sample of ~4 million sources in PS1-MDS to a sample of 184148 candidate cool stars using color cuts. Motivated by the well-known relationship between rotation and stellar activity, we use a multiband periodogram analysis and visual vetting to identify 270 sources that are likely rotating M dwarfs. We derive a new set of polynomials relating M dwarf PS1 colors to fundamental stellar parameters and use them to estimate the masses, distances, effective temperatures, and bolometric luminosities of our sample. We present a catalog containing these values, our measured rotation periods, and cross-matches to other surveys. Our final sample spans periods of <~1-130 days in stars with estimated effective temperatures of ~2700-4000K. Twenty-two of our sources have X-ray cross-matches, and they are found to be relatively X-ray bright as would be expected from selection effects. Our data set provides evidence that Kepler-based searches have not been sensitive to very slowly rotating stars (P_rot_>~70 day), implying that the observed emergence of very slow rotators in studies of low-mass stars may be a systematic effect. We also see a lack of low-amplitude (<2%) variability in objects with intermediate (10-40 day) rotation periods, which, considered in conjunction with other observational results, may be a signpost of a loss of magnetic complexity associated with a phase of rapid spin-down in intermediate-age M dwarfs. This work represents just a first step in exploring stellar variability in data from the PS1-MDS and, in the farther future, Large Synoptic Survey Telescope.
- ID:
- ivo://CDS.VizieR/J/AJ/158/77
- Title:
- Candidates and members of the Pisces-Eridanus stream
- Short Name:
- J/AJ/158/77
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- Pisces-Eridanus (Psc-Eri), a nearby (d~80-226 pc) stellar stream stretching across ~120{deg} of the sky, was recently discovered with Gaia data. The stream was claimed to be ~1 Gyr old, which would make it an exceptional discovery for stellar astrophysics, as star clusters of that age are rare and tend to be distant, limiting their utility as benchmark samples. We test this old age for Psc-Eri in two ways. First, we compare the rotation periods for 101 low-mass members (measured using time-series photometry from the Transiting Exoplanet Survey Satellite) to those of well-studied open clusters. Second, we identify 34 new high-mass candidate members, including the notable stars {lambda} Tauri (an Algol-type eclipsing binary) and HD 1160 (host to a directly imaged object near the hydrogen-burning limit). We conduct an isochronal analysis of the color-magnitude data for these highest-mass members, again comparing our results to those for open clusters. Both analyses show that the stream has an age consistent with that of the Pleiades, i.e., ~120 Myr. This makes the Psc-Eri stream an exciting source of young benchmarkable stars and, potentially, exoplanets located in a more diffuse environment that is distinct from that of the Pleiades and of other dense star clusters.
- ID:
- ivo://CDS.VizieR/J/ApJ/612/L93
- Title:
- Candidates of z~5.5-7 galaxies in the HST-UDF
- Short Name:
- J/ApJ/612/L93
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- We report results from our z~5.5-7 galaxy search in the Hubble Space Telescope Ultra Deep Field (UDF). Using the 400 orbit of Advanced Camera for Surveys data, we found 108 plausible 5.5<=z<=6.5 (or z~6 for short) candidates to m_AB_(z_850_)=30.0mag.
- ID:
- ivo://CDS.VizieR/J/ApJ/872/199
- Title:
- Candidate spectrophotometric standard DA WDs
- Short Name:
- J/ApJ/872/199
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- We present precise photometry and spectroscopy for 23 candidate spectrophotometric standard white dwarfs. The selected stars are distributed in the Northern hemisphere and around the celestial equator, and are all fainter than r~16.5mag. This network of stars, when established as standards and together with the three Hubble Space Telescope primary CALSPEC white dwarfs, will provide a set of spectrophotometric standards to directly calibrate data products to better than 1%. In future deep photometric surveys and facilities, these new faint standard white dwarfs will have enough signal-to-noise ratio to be measured accurately while still avoiding saturation. They will also fall within the dynamic range of large telescopes and their instruments for the foreseeable future. This paper discusses the provenance of the observational data for our candidate standard stars.
- ID:
- ivo://CDS.VizieR/J/A+A/444/643
- Title:
- Candidate spectroscopic binaries in SDSS
- Short Name:
- J/A+A/444/643
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- We have examined the radial velocity data for stars spectroscopically observed by the Sloan Digital Sky Survey (SDSS) more than once to investigate the incidence of spectroscopic binaries, and to evaluate the accuracy of the SDSS stellar radial velocities.
- ID:
- ivo://CDS.VizieR/J/ApJS/227/18
- Title:
- Candidate stellar bowshock nebulae from MIR
- Short Name:
- J/ApJS/227/18
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- We identify 709 arc-shaped mid-infrared nebula in 24um Spitzer Space Telescope or 22um Wide Field Infrared Explorer surveys of the Galactic Plane as probable dusty interstellar bowshocks powered by early-type stars. About 20% are visible at 8um or at shorter mid-infrared wavelengths. The vast majority (660) have no previous identification in the literature. These extended infrared sources are strongly concentrated near the Galactic mid-plane, with an angular scale height of ~0.6{deg}. All host a symmetrically placed star implicated as the source of a stellar wind sweeping up interstellar material. These are candidate "runaway" stars potentially having high velocities in the reference frame of the local medium. Among the 286 objects with measured proper motions, we find an unambiguous excess with velocity vectors aligned with the infrared morphology-kinematic evidence that many of these are "runaway" stars with large peculiar motions responsible for the bowshock signature. We discuss a population of "in situ" bowshocks (~103 objects) that face giant HII regions where the relative motions between the star and ISM may be caused by bulk outflows from an overpressured bubble. We also identify ~58 objects that face 8um bright-rimmed clouds and apparently constitute a sub-class of in situ bowshocks where the stellar wind interacts with a photoevaporative flow (PEF) from an eroding molecular cloud interface (i.e., "PEF bowshocks"). Orientations of the acurate nebulae exhibit a correlation over small angular scales, indicating that external influences such as HII regions are responsible for producing some bowshock nebulae. However, the vast majority of the nebulae in this sample appear to be isolated (499 objects) from obvious external influence
- ID:
- ivo://CDS.VizieR/J/ApJS/232/15
- Title:
- Candidate strong lens systems from DES obs.
- Short Name:
- J/ApJS/232/15
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- We report the results of searches for strong gravitational lens systems in the Dark Energy Survey (DES) Science Verification and Year1 observations. The Science Verification data span approximately 250{deg}^2^ with a median i-band limiting magnitude for extended objects (10{sigma}) of 23.0. The Year 1 data span approximately 2000{deg}^2^ and have an i-band limiting magnitude for extended objects (10{sigma}) of 22.9. As these data sets are both wide and deep, they are particularly useful for identifying strong gravitational lens candidates. Potential strong gravitational lens candidate systems were initially identified based on a color and magnitude selection in the DES object catalogs or because the system is at the location of a previously identified galaxy cluster. Cutout images of potential candidates were then visually scanned using an object viewer and numerically ranked according to whether or not we judged them to be likely strong gravitational lens systems. Having scanned nearly 400000 cutouts, we present 374 candidate strong lens systems, of which 348 are identified for the first time. We provide the R.A. and decl., the magnitudes and photometric properties of the lens and source objects, and the distance (radius) of the source(s) from the lens center for each system.
