J/A+A/605/A82 Rosette Nebula globules (Makela+, 2017)
Rosette nebula globules: Seahorse giving birth to a star.
Makela M.M., Haikala L.K., Gahm G.F.
<Astron. Astrophys. 605, A82 (2017)>
=2017A&A...605A..82M 2017A&A...605A..82M (SIMBAD/NED BibCode)
ADC_Keywords: Carbon monoxide ; Radio lines ; Globules ; H II regions ; YSOs ;
Interstellar medium ; Nebulae, dark ; Photometry, infrared
Keywords: stars: formation - stars: pre-main sequence - stars: protostars -
ISM: individual objects: Rosette Nebula - dust, extinction
Abstract:
The Rosette nebula is an HII region ionized mainly by the stellar
cluster NGC 2244. Elephant trunks, globules, and globulettes are seen
at the interface where the HII region and the surrounding molecular
shell meet.
We have observed a field in the northwestern part of the Rosette
nebula where we study the small globules protruding from the shell.
Our aim is to measure their properties and study their star-formation
history in continuation of our earlier study of the features of the
region.
We imaged the region in broadband near-infrared (NIR) JsHKs filters
and narrowband H2 1-0 S(1), Pβ, and continuum filters using
the SOFI camera at the ESO/NTT. The imaging was used to study the
stellar population and surface brightness, create visual extinction
maps, and locate star formation. Mid-infrared (MIR) Spitzer IRAC and
WISE and optical NOT images were used to further study the star
formation and the structure of the globules. The NIR and MIR
observations indicate an outflow, which is confirmed with CO
observations made with APEX.
Description:
The JHKs photometry of stars in one 5'x5' field in the northwestern
region of the Rosette nebula is presented. The observations were
carried out with the SOFI instrument on NTT. A reddening-free
reference region, OFF, (5'x5') has been observed in an earlier paper.
The magnitudes have been converted to the 2MASS system and the
positional accuracy is better than 0.6". The smallest errors have been
rounded up to 0.01mag.
Radio spectral lines of RN A in the Rosette nebula are presented. The
spectra were obtained with the Atacama Pathfinder Experiment (APEX),
Llano Chajnantor, Chile (O-088.F-9318). The observed molecular lines
were 12CO(3-2), 12CO(2-1), 13CO(3-2), and 13CO(2-1). The APEX
350 and 230GHz single sideband heterodyne APEX-1 and APEX-2 SIS
receivers and the 32768 channel RPG eXtended bandwidth Fast Fourier
Transform Spectrometer (XFFTS) with a bandwidth of 2.5GHz were used.
The channel spacing 76.3kHz corresponds to velocity spacing of 0.1 and
0.07km/s at 230 and 345GHz, respectively. All observations were
performed in position-switching mode. The telescope FWHM is 27" at
230GHz, and 18" at 345GHz, and the corresponding main beam
efficiencies are 0.75 and 0.73. Second order baseline was subtracted
from the spectra. The temperature scale is in Ta* units, i.e.
corrected to outside of the atmosphere but not for beam coupling. The
spectra are presented in one binary table FITS file.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 98 257 Stellar JHKs photometry in the ON region
list.dat 47 16 List of fits CO spectra
apex.fits 2880 297 Spectra
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See also:
J/A+A/567/A108 : Rosette globulettes and shells in the IR (Makela+, 2014)
Byte-by-byte Description of file: table1.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
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1- 3 I3 --- Seq [1/257] Sequential star number in the region
5- 23 A19 --- Name Stellar identification, JHHMMSS.ss+DDMMSS.s
25- 26 I2 h RAh Right ascension (J2000)
28- 29 I2 min RAm Right ascension (J2000)
31- 35 F5.2 s RAs Right ascension (J2000)
37 A1 --- DE- Declination sign (J2000)
38- 39 I2 deg DEd Declination (J2000)
41- 42 I2 arcmin DEm Declination (J2000)
44- 47 F4.1 arcsec DEs Declination (J2000)
49- 53 F5.2 mag Jmag [12.3/20.7] SOFI J magnitude
55- 58 F4.2 mag e_Jmag [0.01/0.13] Formal error on Jmag
60- 64 F5.2 mag Hmag [12.1/19.8] SOFI H magnitude
66- 69 F4.2 mag e_Hmag [0.01/0.14] Formal error on Hmag
71- 75 F5.2 mag Ksmag [1.98/19.6] SOFI Ks magnitude
77- 80 F4.2 mag e_Ksmag [0.01/0.14] Formal error on Ksmag
82- 86 F5.2 mag J-H J-H colour index
88- 92 F5.2 mag H-K H-Ks colour index
94- 98 A5 --- 2M [2MASS] Star in the 2MASS catalog
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Byte-by-byte Description of file: list.dat
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Bytes Format Units Label Explanations
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1- 9 A9 --- Line Observed line
11- 15 A5 --- Object Object name
17- 28 A12 --- Tel Telescope name
30- 36 F7.3 GHz RestFreq Rest frequency
38- 47 A10 "date" Obs.Date Observation date
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Acknowledgements:
Minja Makela, minjammakela(at)gmail.com
(End) Minja M. Makela [Germany], Patricia Vannier [CDS] 19-Jul-2017