J/MNRAS/331/474 ubvyβ photometry in the Lupus dark cloud (Franco, 2002)
On the infrared void in the Lupus dark clouds.
Franco G.A.P.
<Mon. Not. R. Astron. Soc. 331, 474 (2002)>
=2002MNRAS.331..474F 2002MNRAS.331..474F
ADC_Keywords: Molecular clouds ; Photometry, uvby, beta
Keywords: stars: distances - ISM: clouds - dust, extinction -
ISM: individual: Lupus
Abstract:
Stroemgren uvbyβ photometry observations obtained for 205 stars
in the general direction of a void in the IRAS 100-µm emission from
the Lupus dark cloud complex are presented and analysed. The colour
excess versus distance diagram confirms the existence of a region
depleted from interstellar material, which is also seen in the ROSAT
soft X-ray background emission map. The distance to the surrounding
material is estimated as being within the interval from 60 to 100pc.
This result is in disagreement with previous distance estimates to the
supposed supernova that has been suggested as responsible for clearing
the region from dust. As an alternative, the data presented support
the suggestion that the void may have been produced by the detachment
of material from the interface between LoopI and the Local Bubble as a
consequence of hydromagnetic instabilities. Moreover, the distribution
of colour excess as a function of distance supports a value of ∼150pc
as the most probable distance to the dark cloud known as Lupus1.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 96 201 Stroemgren photometry of stars earlier than G0
towards Lupus (SAO stars)
table1b.dat 76 4 Stroemgren photometry of stars earlier than G0
towards Lupus (SA stars)
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See also:
J/A+A/320/185 : UBVRIcJHKL photometry in Lup (Wichmann+ 1997)
I/131 : SAO Star Catalog J2000 (SAO Staff 1966; USNO, ADC 1990)
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 6 I6 --- SAO SAO (I/131) Catalog number
8- 13 I6 --- HD ? HD (III/135) number
15- 29 A15 --- SpType MK spectral type
31- 32 I2 h RAh Right ascension (1950)
34- 35 I2 min RAm Right ascension (1950)
37- 38 I2 s RAs Right ascension (1950)
40 A1 --- DE- Declination sign (1950)
41- 42 I2 deg DEd Declination (1950)
44- 45 I2 arcmin DEm Declination (1950)
47- 52 F6.3 mag Vmag Johnson computed V magnitude
54- 55 I2 mmag e_Vmag rms uncertainty on Vmag
57- 62 F6.3 mag b-y b-y Stroemgren colour index
64- 65 I2 mmag e_b-y rms uncertainty on b-y
67- 71 F5.3 mag m1 m1 Stroemgren colour index
73- 74 I2 mmag e_m1 rms uncertainty on m1
76- 80 F5.3 mag c1 c1 Stroemgren colour index
82- 83 I2 mmag e_c1 rms uncertainty on c1
85 I1 --- o_b-y Number of nights in which the star was
observed in uvby
87- 91 F5.3 mag beta ? Hβ Stroemgren index
93- 94 I2 mmag e_beta ? rms uncertainty on beta
96- 97 I2 --- o_beta Number of nights in which the star was
observed in Hbeta
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Byte-by-byte Description of file: table1b.dat
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Bytes Format Units Label Explanations
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1- 10 A10 --- SA SA name
12- 13 I2 h RAh Right ascension (1900)
15- 16 I2 min RAm Right ascension (1900)
18- 19 I2 s RAs Right ascension (1900)
21 A1 --- DE- Declination sign (1900)
22- 23 I2 deg DEd Declination (1900)
25- 26 I2 arcmin DEm Declination (1900)
28- 33 F6.3 mag Vmag Johnson computed V magnitude
35- 36 I2 mmag e_Vmag rms uncertainty on Vmag
38- 42 F5.3 mag b-y b-y Stroemgren colour index
44- 45 I2 mmag e_b-y rms uncertainty on b-y
47- 51 F5.3 mag m1 m1 Stroemgren colour index
53- 54 I2 mmag e_m1 rms uncertainty on m1
56- 60 F5.3 mag c1 c1 Stroemgren colour index
62- 63 I2 mmag e_c1 rms uncertainty on c1
65 I1 --- o_b-y Number of nights in which the star was
observed in uvby
67- 71 F5.3 mag beta ? Stroemgren Hβ index
73- 74 I2 mmag e_beta ? rms uncertainty on Hbeta
76- 77 I2 --- o_beta Number of nights in which the star was
observed in Hbeta
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History:
From electronic version of the journal
(End) James Marcout, Patricia Bauer [CDS] 22-Apr-2002