- ID:
- ivo://CDS.VizieR/J/MNRAS/390/1185
- Title:
- JHK photometry in 2 star-forming regions
- Short Name:
- J/MNRAS/390/1185
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- IRAS 21413+5442 and IRAS 21407+5441 are two massive star-forming regions of high luminosity, likely associated with each other. Near-infrared (NIR) photometry on these two IRAS sources was performed at United Kingdom Infrared Telescope (UKIRT) using the UFTI under excellent seeing conditions yielding an angular resolution of ~0.5arcsec. Our results reveal details of stellar content to a completeness limit (90 per cent) of J=18.5, H=18.0 and K=17.5mag in the two regions. In IRAS 21413+5442, we identify a late O-type star, having large H-K colour, to be near the centre of the CO jets observed by earlier authors. The UKIRT images reveal in IRAS 21407+5441, a faint but clear compact HII region around a central high- and intermediate-mass star cluster. We have detected a number of sources with large H-K colour which are not detected in J band. We also present the GMRT radio continuum map at 1.28GHz covering the entire region surrounding the two star-forming clouds.
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- ID:
- ivo://CDS.VizieR/J/AJ/131/951
- Title:
- JHK photometry in the direction of RCW 121
- Short Name:
- J/AJ/131/951
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- We report near-infrared (NIR) broadband and narrowband photometric observations in the direction of the IRAS 17149-3916 source that reveal the presence of a young cluster of massive stars embedded in an HII region coincident with RCW 121. These observations, together with published radio data and Midcourse Space Experiment and Spitzer images, were used to determine some of the physical parameters of the region. We found 96 cluster member candidates in an area of about 1.5x2.0arcmin^2^, 30% of them showing excess emission in the near-IR.
- ID:
- ivo://CDS.VizieR/J/ApJ/602/850
- Title:
- JHK' photometry near IRAS 18507+0121
- Short Name:
- J/ApJ/602/850
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- We have observed the massive star-forming region IRAS 18507+0121 at millimeter wavelengths in 3mm continuum emission, H^13^CO+ (J=1-0) and SiO (v=0,J=2-1) line emission, and at near-infrared (NIR) wavelengths between 1.2 and 2.1{mu}m. Two compact molecular cores are detected: one north and one south, separated by ~40". The northern molecular core contains a newly discovered, deeply embedded, B2 protostar surrounded by several hundred solar masses of warm gas and dust, G34.4+0.23 MM. Based on the presence of warm dust emission and the lack of detection at NIR wavelengths, we suggest that G34.4+0.23 MM may represent the relatively rare discovery of a massive protostar (e.g., analogous to a low-mass "Class 0" protostar). The southern molecular core is associated with an NIR cluster of young stars and an ultracompact HII region, G34.4+0.23, with a central B0.5 star. The fraction of NIR stars with excess infrared emission indicative of circumstellar material is greater than 50%, which suggests an upper limit on the age of the IRAS 18507+0121 star-forming region of 3Myr.
- ID:
- ivo://CDS.VizieR/J/A+A/464/909
- Title:
- JHK photometry near IRAS 06145+1455
- Short Name:
- J/A+A/464/909
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- Our goal in this paper is to study stars and molecular gas in the direction of IRAS 06145+1455 (WB89-789). The kinematic distance of the associated molecular cloud is 11.9kpc. With a galactocentric distance of ~20.2kpc, this object is at the edge of the (molecular) disk of the Galaxy. We use near-IR (J, H, K), molecular line-, and dust continuum observations.
- ID:
- ivo://CDS.VizieR/J/AJ/121/3160
- Title:
- JHK photometry near the Trapezium region
- Short Name:
- J/AJ/121/3160
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- We present an analysis of J, H, and Ks time-series photometry obtained with the southern 2MASS telescope over a 0.84{deg}x6{deg} region centered near the Trapezium region of the Orion Nebula cluster. These data are used to establish the near-infrared variability properties of premain-sequence stars in Orion on timescales of ~1-36days, ~2 months, and ~2 years. A total of 1235 near-infrared variable stars are identified, ~93% of which are likely associated with the Orion A molecular cloud.
- ID:
- ivo://CDS.VizieR/J/A+A/429/115
- Title:
- JHK' photometry of Blue Compact Dwarf Galaxies
- Short Name:
- J/A+A/429/115
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- This paper is part of a series of publications which present a systematic study of Blue Compact Dwarf (BCD) Galaxies in the near infrared (NIR). Compared to the visible light, NIR data allow a better separation of the starburst emission from the light distribution of the old stellar low-surface brightness (LSB) host galaxy. We analyze deep NIR broad band images of a sample of 11 BCDs, observed with the Calar Alto 3.6m telescope. This work enlarges the samples presented in preceding papers of this study (Noeske et al., 2003A&A...410..481N, Cairos et al., 2003ApJ...593..312C) by BCDs of the most common morphological type, displaying a regular elliptical LSB host galaxy. The data presented here allow the detection and quantitative study of the extended stellar LSB host galaxy in all sample BCDs.
- ID:
- ivo://CDS.VizieR/J/MNRAS/361/211
- Title:
- JHK photometry of brown dwarfs in Orion
- Short Name:
- J/MNRAS/361/211
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- We report the results of a deep near-infrared (JHK) survey of the outer parts of the Trapezium Cluster with Gemini South/Flamingos. 396 sources were detected in a 26-arcmin^2^ area, including 138 brown dwarf candidates, defined as M<0.075M_{sun}_ for an assumed age of 1Myr. Only 33 of the brown dwarf candidates are planetary mass candidates with estimated masses in the range 0.003<M<0.012M_{sun}_. In an extinction-limited sample (AV<5) complete to approximately 0.005M_{sun}_ (5M_Jup_) the mass function appears to drop by a factor of 2 at the deuterium burning threshold, i.e. at planetary masses. After allowing for background contamination it is likely that planetary mass objects at 3-13M_Jup_ number <10% of the cluster population, with an upper limit of 13%. Analysis of the spatial distribution of stars and brown dwarf candidates suggests that brown dwarfs and very low-mass stars (M<0.1M_{sun}_) are less likely than more massive stars to have wide (>150AU) binary companions.
- ID:
- ivo://CDS.VizieR/J/A+A/525/A1
- Title:
- JHK photometry of CBJC 8 sources
- Short Name:
- J/A+A/525/A1
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- The infrared cluster CBJC 8 is associated with a 6.7GHz methanol maser and a compact radio-continuum source, G85.40-0.00. It is located at a distance of about 8kpc. The aim is to study the characteristics of this distant and compact embedded cluster and derive the properties of its stellar population. We present new ground-based near- and mid-imaging observations of this region. The calibrated images were analysed together with archive Spitzer IRAC images. Based on the discovery of a considerable fraction of embedded sources with infrared excess emission that are concentrated within a radius around 16arcsec centred near the position of the compact HII region G85.40-0.00, we were able to confirm the presence of a very young embedded cluster. It was found to contain more than 58 members brighter than M_K_=2.6, with two-thirds of them showing significant near- or mid-IR excess emission. Spectral energy distributions and extrapolated total luminosities are presented for nine sources with large mid-infrared excesses that were measured in all four IRAC bands. For the brightest of these, G8540A, which is associated with a methanol maser and a compact HII region, we fitted a model of an infalling envelope plus disc plus central star to its observed 1.6 to 850um fluxes to get an idea of its physical properties. We also report the presence of a single 2.12um molecular hydrogen line emission knot near the centre of the cluster, suggesting the outflow activity.
- ID:
- ivo://CDS.VizieR/J/A+A/399/147
- Title:
- JHK photometry of C-cloud IRAS sources
- Short Name:
- J/A+A/399/147
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- Results of NIR (JHK) photometry for about 1000 stars in 10 fields around IRAS sources previously recognized as related to star forming sites in the Vela Molecular Ridge C and D clouds. Only objects at least detected in the K band are listed. IRAS sources are indicated by the short designation adopted in the Paper (# IRS). Due to the presence of bad pixels or because of the closeness to the image edge, photometry could not be performed on a few objects and in such cases magnitudes and errors are not given at all. Note that, for IRS 33, coordinates are offsets (in arcsec) from source # 4.
- ID:
- ivo://CDS.VizieR/J/A+A/375/539
- Title:
- JHK photometry of compact HII regions in Cyg X
- Short Name:
- J/A+A/375/539
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- This table provides positions and magnitudes of all the objects a automatically detected in the frames centered at the positions of compact HII regions as described in the paper. All the regions are contained in a single table, with the region denomination as given in the paper before the data of the detected objects.
