- ID:
- ivo://CDS.VizieR/J/AJ/128/2364
- Title:
- JHK photometry of RCW 95 HII region
- Short Name:
- J/AJ/128/2364
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- Near-IR imaging in the direction of the IRAS 15408-5356 point source, which is associated with the RCW 95 HII region, revealed a young and massive stellar cluster. We detected 136 member candidates up to our completeness limit, embedded in an infrared nebula and concentrated in an area of about 3pc^2^. About 60% of the candidates detected in all three of the J, H, and K bands present infrared excess at 2.2{mu}m. he UV photons provided by the most massive stars are enough to explain the observed free-free emission at radio wavelengths and the integrated infrared luminosity produced by the heated dust. The near-IR counterpart of the IRAS point source was identified using a more accurate position from the Midcourse Space Experiment (MSX) catalog; it coincides with the peak of emission in the MSX mid-IR bands. The measured integrated flux density of the infrared nebula at the K band is compatible with the expected free-free emission derived from the radio data, but an excess at the J and H bands was detected and may be due to either nonhomogeneous absorption across the nebula or to the presence of scattered stellar light, more prominent at smaller wavelengths.
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- ID:
- ivo://CDS.VizieR/J/MNRAS/398/1368
- Title:
- JHK photometry of Sh 2-307 HII region
- Short Name:
- J/MNRAS/398/1368
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- This work aims to study the Sh 2-307 HII region and related stellar population. Near-infrared imaging and spectroscopic observations in the direction of Sh 2-307 were performed using the Ohio State InfraRed Imager/Spectrometer (OSIRIS) at the Southern Observatory for Astrophysical Research (SOAR) Telescope. The photometric data were analysed from colour-colour and colour-magnitude diagrams, while the spectroscopic results were interpreted from the comparison of the science spectra with those obtained from known OB stars.
- ID:
- ivo://CDS.VizieR/J/A+A/365/110
- Title:
- JHK photometry of Vega-type and PMS stars
- Short Name:
- J/A+A/365/110
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- File table1.dat contains near-infrared JHK magnitudes of a sample of 18 Vega-like and post-T Tauri stars observed by the EXPORT collaboration. File table2.dat contains near-infrared JHK magnitudes of a sample of 4 pre-main sequence stars observed by EXPORT. The data were taken during four observing runs in the period May 1998 to January 1999.
- ID:
- ivo://CDS.VizieR/J/AJ/139/950
- Title:
- JHKs photometry in ONC
- Short Name:
- J/AJ/139/950
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- We present J, H, and Ks photometry of the Orion Nebula Cluster (ONC) obtained at the CTIO/Blanco 4m telescope at Cerro Tololo with the Infrared Side Port Imager camera. From the observations we have assembled a catalog of about ~7800 sources distributed over an area of approximately 30'x40', the largest of any survey deeper than the Two Micron All Sky Survey (2MASS) in this region. The catalog provides absolute coordinates accurate to about 0.15-arcsec and 3{sigma} photometry in the 2MASS system down to J~=19.5mag, H~=18.0mag, Ks~=18.5mag, enough to detect planetary size objects 1Myr old under A_V_~=10mag of extinction at the distance of the Orion Nebula.
- ID:
- ivo://CDS.VizieR/J/AJ/124/1001
- Title:
- JHKs photometry of Cha I variables
- Short Name:
- J/AJ/124/1001
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- We present the results of a J, H, and Ks photometric monitoring campaign of a 0.72{deg}x6{deg} area centered on the Chamaeleon I star-forming region. Data were obtained on 15 separate nights over a 4 month time interval, from January to May 2000, using the Two Micron All Sky Survey south telescope. Out of a total of 34,539 sources brighter than the photometric completeness limits (J=16.0, H=15.2, and Ks=14.8), 95 exhibit near-infrared variability in one or more bands. The variables can be grouped into a population of bright, red objects that are associated with the Chamaeleon I association and a population of faint, blue variables that are dispersed over the full 6{deg} of the survey and are likely field stars or older pre-main-sequence stars unrelated to the present-day Chamaeleon I molecular cloud. Ten new candidate members of Chamaeleon I, including eight brown dwarf candidates, have been identified based on variability and/or near-infrared-excess emission in the J-H versus H-Ks color-color diagram. We also provide a compendium of astrometry and J, H, and Ks photometry for previously identified members and candidate members of Chamaeleon I.
- ID:
- ivo://CDS.VizieR/J/MNRAS/355/1237
- Title:
- JHKs photometry of G287.84-0.82 members
- Short Name:
- J/MNRAS/355/1237
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- We have studied the properties of an infrared cluster embedded in the gas and dust of the southern part of the Carina nebula (NGC 3372), where the probable existence of current star formation has already been predicted. We used mid-infrared (A and C bands) and near-infrared (JHKs) images from the Midcourse Space Experiment and the Two-Micron All-Sky Survey, respectively, combined with an optical H{alpha} narrow-band filter image obtained at the Cerro Tololo Inter-American Observatory. The infrared star cluster has at least 17 members, and its parameters, radius and stellar density are in very good agreement with high- to intermediate-mass star formation scenarios. The detected infrared sources have roughly the same intrinsic infrared excess determined from their position in colour-colour and colour-magnitude diagrams, suggesting that these objects could be related to pre-main-sequence stars of high to intermediate mass. Furthermore, we present a low-dispersion spectrum of the LS 1883 (O9.5V) star located near the centre of the infrared cluster. The position of this object in the colour-colour and colour-magnitude infrared diagrams lies close to the reddening vector of a zero-age main-sequence O9V spectral-type star, and it seems to be the first star of this cluster to emerge. All these facts are consistent with the current star-forming scenarios associated with highly embedded star clusters.
- ID:
- ivo://CDS.VizieR/J/MNRAS/366/739
- Title:
- JHKs photometry of Hourglass nebula
- Short Name:
- J/MNRAS/366/739
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- A detailed study of the Hourglass nebula in the M8 star-forming region is presented. The study is mainly based on recent subarcsec-resolution JHKs images taken at Las Campanas Observatory and complemented with archival Hubble Space Telescope (HST) images and long-slit spectroscopy retrieved from the European Southern Observatory Archive Facility. Using the new numerical code CHORIZOS, we estimate the distance to the earliest stars in the region to be 1.25kpc. Infrared photometry of all the sources detected in the field is given.
- ID:
- ivo://CDS.VizieR/J/AJ/132/2653
- Title:
- JHKs photometry of N11 young stellar objects
- Short Name:
- J/AJ/132/2653
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- Near-infrared observations have been carried out to survey young stellar objects in the second-largest HII region in the Large Magellanic Cloud, N11. A total area of about 700 arcmin2 is covered in the J, H, and Ks bands. We selected a total of 559 OB and 127 Herbig Ae/Be star candidates out of the detected sources based on their near-infrared colors and magnitudes. The existence of these young stellar objects indicates that star formation activity is underway in the whole N11 region. Many Herbig Ae/Be star candidates are distributed around the periphery of the OB association LH 9. Spatial correlations of the OB and Herbig Ae/Be star candidates with the objects observed at other wavelengths (optical, radio continuum, H{alpha}, CO, and X-ray) suggest that the birth of the young stellar populations in peripheral molecular clouds was triggered originally by LH 9. It is likely that the trigger for this star formation was an expanding supershell blown by the OB association. In N11 a new generation of stars would have been formed in the clouds developed from swept-up interstellar medium.
- ID:
- ivo://CDS.VizieR/J/A+A/409/147
- Title:
- J magnitude of IC 348 brown dwarfs
- Short Name:
- J/A+A/409/147
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- We use a deep near-infrared census of the young stellar cluster IC 348 to construct and analyze its luminosity function. Our mosaic image of IC 348 covers the full extent of the cluster with a completeness limit of J~19.5 and is therefore sensitive for 2Myr old cluster members with masses as low as M>=0.005M_{sun}_ or the mean extinction of the known cluster members (A_V_~3.5mag).
- ID:
- ivo://CDS.VizieR/J/ApJ/540/1016
- Title:
- K-band & NICMOS photometry of Trapezium Cluster
- Short Name:
- J/ApJ/540/1016
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- We have obtained images of the Trapezium Cluster (140"x140"; 0.3pc x 0.3pc) with the Hubble Space Telescope Near-Infrared Camera and Multi-Object Spectrometer (NICMOS). Combining these data with new ground-based K-band spectra (R=800) and existing spectral types and photometry, we have constructed an H-R diagram and used it and other arguments to infer masses and ages.
