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J/A+A/352/228       Transitional YSOs candidates             (Magnier+, 1999)

Transitional YSOs: candidates from flat-spectrum IRAS sources Magnier E.A., Volp A.W., Laan K., Van den Ancker M.E., Waters L.B.F.M. <Astron. Astrophys. 352, 228 (1999)> =1999A&A...352..228M
ADC_Keywords: YSOs ; Infrared sources Keywords: stars: circumstellar matter - stars: evolution - stars: formation - stars: mass-loss - stars: pre-main sequence Abstract: We are searching for Young Stellar Objects (YSOs) near the boundary between protostars and pre-main-sequence objects, what we term Transitional YSOs. We have identified a sample of 125 objects as candidate transitional YSOs on the basis of IRAS colors and the optical appearance on POSS plates. We have obtained optical and near-IR imaging of 82 objects accessible from the Northern Hemisphere and optical images of 62 sources accessible from the South. We also created deconvolved 60µm IRAS images of all sources. We have classified the objects on the basis of their morphology in the optical and near-IR images. We find that the majority of our objects are associated with star-forming regions, confirming our expectation that the bulk of these objects are YSOs. Of the 125 objects, 28 have a variety of characteristics very similar to other transitional YSOs, while another 22 show some of these characteristics. Furthermore we have found seven objects to be good candidates for members of the Herbig Ae/Be stellar group, of which three are newly identified as such. File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table1.dat 117 125 Transitional YSO candidate IRAS sources table1.tex 236 179 LaTeX version of table1 table1.ps 72 871 PostScript version of table1 south/* 0 62 *Poscript Figures for Southern observations north/* 0 83 *Poscript Figures for Northern observations
Note on north/* and south/*: Northern and Southern observations have been performed by two individual teams, and 23 sources have a figure in the two subdirectories. 3 objects, IRAS 10075-6647, IRAS 10292-4148 and IRAS 19111+0212 have no figures.
See also: II/125 : IRAS catalogue of Point Sources, Version 2.0 (IPAC 1986) J/ApJ/397/520 : IRAS obs. of YSO in Corona Australis (Wilking+, 1992) Byte-by-byte Description of file: table1.dat
Bytes Format Units Label Explanations
1- 10 A10 --- IRAS IRAS designation (NNNNN+NNNN) 12- 13 I2 h RAh Right ascension (J2000) 15- 16 I2 min RAm Right ascension (J2000) 18- 21 F4.1 s RAs Right ascension (J2000) 23 A1 --- DE- Declination sign (J2000) 24- 25 I2 deg DEd Declination (J2000) 27- 28 I2 arcmin DEm Declination (J2000) 30- 31 I2 arcsec DEs Declination (J2000) 33 I1 --- ID [1/7] Category (1) 35- 45 A11 --- southFile Name of postscript file, in "south" subdirectory 46 A1 --- Missing [*] files not present 47- 53 A7 --- northFile Name of postscript file, in "north" subdirectory 55-117 A63 --- Note Notes
Note (1): The category number takes the following values: 1: A likely transitional YSO: A single moderately-bright, very-red stellar object with extensive associated reflection nebulosity. (28 objects) 2: A possible transitional YSO: a moderately red stellar object with weak nebulosity or a significantly red object with no nebulosity. (22 objects) 3: A YSO group: Several very red objects, usually with extended nebulosity. No single object stands out. (21 objects) 4: Bright star. (7 objects) 5: A cluster of stars: usually a red cluster with no single very red star. (18 objects) 6: A galaxy. (11 objects) 7: nothing: no object stands out, and no object can be associated with any of the other classes. (18 objects)
Acknowledgements: Arjan Volp
(End) Patricia Bauer [CDS] 28-Jan-2000
The document above follows the rules of the Standard Description for Astronomical Catalogues.From this documentation it is possible to generate f77 program to load files into arrays or line by line

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