J/AJ/115/1989 Distances of galactic planetary nebulae (Tajitsu+, 1998)
A new distance indicator to galactic planetary nebulae based upon IRAS fluxes.
Tajitsu A., Tamura S.
<Astron. J., 115, 1989-2008 (1998)>
=1998AJ....115.1989T 1998AJ....115.1989T
ADC_Keywords: Planetary nebulae ; Infrared sources ; Stars, distances
Keywords: infrared radiation - planetary nebulae: general
Abstract:
It is well known that the IRAS colors of planetary nebulae (PNe)
are very similar to blackbody colors. Taking account of this
characteristic, we define a new method to obtain some information
about the distance to PNe by blackbody fitting of IRAS four-band
fluxes, assuming these fluxes are due to thermal emission from the
nebular dust envelope. The fit should have two free parameters - the
dust temperature TD and the distance-dependent "scaling factor" A -
under the assumption of uniform dust mass. We find that the A-values
have a good correlation with published distances. The scaling factor A
could be a more effective distance scale than others, because many PNe
have been detected as IRAS sources and the extinction of IRAS fluxes
is not so severe, and is known. We also find that TD is concentrated
between 100 and 200K, with a typical value of about 150K.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table3.dat 154 659 Results of the blackbody fitting of iras fluxes
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See also:
V/84 : Strasbourg-ESO Catalogue of Galactic Planetary Nebulae (Acker+, 1992)
II/125 : IRAS catalogue of Point Sources, Version 2.0 (IPAC 1986)
Byte-by-byte Description of file: table3.dat
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Bytes Format Units Label Explanations
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1- 11 A11 --- PN PN name (Glll.l+dd.d) (1)
13- 25 A13 --- Name Other name
27 A1 --- l_F12um Limit flag on F12um
28- 33 F6.2 Jy F12um IRAS flux at 12um
35 A1 --- l_F25um Limit flag on F25um
36- 44 F9.3 Jy F25um IRAS flux at 25um
46 A1 --- l_F60um Limit flag on F60um
47- 53 F7.2 Jy F60um IRAS flux at 60um
55 A1 --- l_F100um Limit flag on F100um
56- 62 F7.2 Jy F100um IRAS flux at 100um
65- 66 I2 % e_F12um ? rms uncertainty on F12um
68- 69 I2 % e_F25um ? rms uncertainty on F25um
71- 72 I2 % e_F60um ? rms uncertainty on F60um
74- 75 I2 % e_F100um ? rms uncertainty on F100um
77- 81 F5.1 arcsec Thetaopt ? Optical diameter from Strasbourg-ESO catalog
(1992, Cat. V/84)
82- 84 A3 --- n_Thetaopt [St. ] St. : stellar
86- 91 F6.2 Jy F12umc Color- and diameter-corrected 12um IRAS flux
93- 99 F7.2 Jy F25umc Color- and diameter-corrected 25um IRAS flux
101-107 F7.2 Jy F60umc Color- and diameter-corrected 60um IRAS flux
109-115 F7.2 Jy F100umc Color- and diameter-corrected 100um IRAS flux
117-120 I4 K Tdust Dust temperature
122-127 F6.2 [-] logA logarithm of the scaling factor A as the
fitting result
129-133 F5.1 kpc Diras This work estimated distance
135-139 F5.2 kpc DMa84 ?=- Estimated distance from Maciel,
1984A&AS...55..253M 1984A&AS...55..253M
141-146 F6.3 kpc DCKS92 ?=- Estimated distance from Cahn et al., 1992,
Cat. J/A+AS/94/399
148-154 A7 --- Notes Notes (2)
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Note (1): PN G352.6+01.1 corrected into PN G352.6+00.1 by CDS.
Note (2): Notes as follows:
N = object with no distance estimations in either CKS92 or Ma84
B = object could be a Galactic bulge PN (logA←13)
* = best-fit objects (130K<Tdust<180K).
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History:
From electronic version of the journal
(End) Patricia Vannier [CDS] 05-Oct-2006