- ID:
- ivo://CDS.VizieR/J/A+A/482/585
- Title:
- JHK photometry of stars in Sh 2-212
- Short Name:
- J/A+A/482/585
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- We present CO millimetre observations of this region obtained at the IRAM 30-m telescope to investigate the distribution of associated molecular material. We also use deep JHK observations obtained at the CFHT to study the stellar content of the region, and radio observations obtained at the VLA to look for the presence of an ultra-compact (UC) HII region and for maser emission.
Number of results to display per page
Search Results
- ID:
- ivo://CDS.VizieR/J/MNRAS/353/1025
- Title:
- JHK photometry of 4 W51 star clusters
- Short Name:
- J/MNRAS/353/1025
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- We present sub-arcsecond (0.35-0.9"), near-infrared J-, H- and K-band photometric observations of six fields along the W51 giant molecular cloud (W51 GMC). Our observations reveal four new, embedded clusters and provide a new high-resolution (0.35") view of the W51 IRS2 (G49.5-0.4) region. The cluster associated with G48.9-0.3 is found to be a double cluster enclosed in a nest of near-infrared nebulosity. We construct stellar surface density maps for four major clusters in the W51 GMC. These unveil the underlying hierarchical structure.
- ID:
- ivo://CDS.VizieR/J/A+A/496/177
- Title:
- JHKs and GLIMPSE photometry of RCW 120
- Short Name:
- J/A+A/496/177
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- This study deals with the star formation triggered by HII regions. We wish to take advantage of the very simple morphology of RCW 120 - a perfect bubble - to understand the mechanisms triggering star formation around an HII region and to establish what kind of stars are formed there. We present 870um observations of RCW 120, obtained with the APEX-LABOCA camera. These show the distribution of cold dust, and thus of neutral material. We use Spitzer-MIPS observations at 24um and 70um to detect the young stellar objects present in this region and to estimate their evolutionary stages.
- ID:
- ivo://CDS.VizieR/J/A+A/472/835
- Title:
- JHKs and GLIMPSE photometry of RCW 120
- Short Name:
- J/A+A/472/835
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- To investigate the process of star formation triggered by the expansion of an HII region, we present a multi-wavelength analysis of the Galactic HII region RCW 120 and its surroundings. The collect and collapse model predicts that the layer of gas and dust accumulated between the ionization and shock fronts during the expansion of the HII region collapses and forms dense fragments, giving rise to potential sites of massive-star formation. The aim of our study is to look for such massive fragments and massive young stars on the borders of RCW 120. We mapped the RCW 120 region in the cold dust continuum emission at 1.2 mm to search for these fragments. We supplemented this study with the available near- (2MASS) and mid-IR (GLIMPSE) data to locate the IR sources observed towards this region and to analyse their properties. We then compared the observational results with the predictions of Hosokawa & Inutsuka's model (2005ApJ...623..917H; 2006ApJ...646..240H).
- ID:
- ivo://CDS.VizieR/J/MNRAS/380/1497
- Title:
- JHKs & GLIMPSE photometry towards G305.2+0.2
- Short Name:
- J/MNRAS/380/1497
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- We present deep, wide field J, H and Ks images taken with Infrared Imager and Spectrometer 2 (IRIS2) on the Anglo-Australian Telescope, towards the massive star formation region G305.2+0.2. Combined with 3.6, 4.5, 5.8 and 8.0um data from the Galactic Legacy Infrared Mid-Plane Survey Extraordinaire (GLIMPSE) survey on the Spitzer Space Telescope, we investigate the properties of the embedded stellar populations. After removing contamination from foreground stars, we separate the sources based on their infrared (IR) colour. Strong extended emission in the GLIMPSE images hampers investigation of the most embedded sources towards the known sites of massive star formation. However, we find a sizeable population of IR excess sources in the surrounding region free from these completeness effects. Investigation reveals the recent star formation activity in the region is more widespread than previously known.
- ID:
- ivo://CDS.VizieR/J/AJ/125/1940
- Title:
- JHKs photometry in LMC HII region N11B
- Short Name:
- J/AJ/125/1940
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- The second largest H II region in the Large Magellanic Cloud, N11B (LHA 120-N 11B) has been surveyed in the near-IR. We present JHKs images of the N11B nebula. These images are combined with CO (1->0) emission-line data and with archival New Technology Telescope and Hubble Space Telescope WFPC2 optical images to address the star formation activity of the region. IR photometry of all the IR sources detected is given. We confirm that a second generation of stars is currently forming in the N11B region. Our IR images show the presence of several bright IR sources that appear to be located toward the molecular cloud as seen from the CO emission in the area.
- ID:
- ivo://CDS.VizieR/J/A+A/422/129
- Title:
- JHKs photometry in N159 (LMC)
- Short Name:
- J/A+A/422/129
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- We study the Large Magellanic Cloud Papillon Nebula (N 159-5), a conspicuous High Excitation Blob (HEB) lying in the star forming complex N 159. Using JHK near-infrared photometry obtained at the ESO VLT with the ISAAC camera, we examine the stellar populations associated with the Papillon, tracing their history using stellar evolution models. Two populations are revealed: one composed of young, massive stars with an age ~3Myr, and a second consisting of older lower mass stars of age spreading between 1 and 10Gyr. We analyze the properties of those populations and discuss their significance in the context of N 159. We also estimate that if the star at the center of the Papillon is single its initial mass is ~50 solar masses and it is affected by an extinction Av~7mag.
- ID:
- ivo://CDS.VizieR/J/MNRAS/367/513
- Title:
- JHKs[3.5][4.5] photometry of NGC 3372
- Short Name:
- J/MNRAS/367/513
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- We present the results of an imaging survey, from the optical to the mid-infrared, of the dark cloud associated with Car I, a dense cloud that is subject to an intense ultraviolet radiation field from the rich stellar cluster Trumpler 14. New ground-based broad- and narrow-band near-infrared and narrow-band optical images are analysed in combination with archived Spitzer/Infra-Red Array Camera (IRAC) images to study this photodissociation region (PDR) and the triggering of a new generation of stars within the cloud, particularly close to its edges. Evidence is given of a clumpy morphology of the dense cloud. The ionization/dissociation front is delineated at the edges of these clumps. The existence of a number of embedded low- to intermediate-mass pre-main-sequence objects is confirmed by their considerable infrared excesses arising from discs and/or detectable X-ray emission. Most of the young stellar objects (YSOs) are located on or just behind ionization fronts, though a few are also outside the cloud. The infrared properties of the YSOs are discussed.
- ID:
- ivo://CDS.VizieR/J/ApJ/596/1064
- Title:
- JHKs photometry of S269
- Short Name:
- J/ApJ/596/1064
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- The star-forming region S269 is studied with deep JHKs and H_2_v=1-0S(1) images and K-band spectroscopy. The JHKs images were obtained on 2002 March 1, by using the Simultaneous-3color InfraRed Imager for Unbiased Survey of Nagoya University mounted on the InfraRed Survey Facility (IRSF) 1.4m telescope of Nagoya University at Sutherland, South African Astronomical Observatory. We obtained the broadband J, H, and K' images and narrow-band H_2_v=1-0S(1) image on 1999 November 22, using the Okayama Astrophysical System for Infrared Imaging and Spectroscopy mounted on the Okayama 1.88m telescope.
- ID:
- ivo://CDS.VizieR/J/ApJS/155/123
- Title:
- JHKs photometry of ultracompact HII regions
- Short Name:
- J/ApJS/155/123
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- We present adaptive optics (AO) assisted J, H, and K/K' images of eight ultracompact HII (UC HII) regions taken with the ALFA (Adaptive optics with a Laser For Astronomy) and ADONIS (ADaptive Optics Near-Infrared System) AO systems at Calar Alto and La Silla observatories. The images show details of the stellar population and the near-IR morphology of UC HII regions with unprecedented resolution.
