2010A&A...518A..62G


Query : 2010A&A...518A..62G

2010A&A...518A..62G - Astronomy and Astrophysics, volume 518, A62-62 (2010/7-2)

Extinction AV, R towards emission nebulae derived from common upper level Paschen-Balmer hydrogen lines.

GREVE A.

Abstract (from CDS):

The reddening in and around emission nebulae is characterized by the extinction AV and the ratio R of the absolute-to-selective absorption. Both are usually derived from the photometry of a single star or cluster stars that are associated with an emission nebula. Using the parameterized reddening relation published by Cardelli et al. (1989ApJ...345..245C), we show that AV and R can be derived with good precision from the observation of a set of common upper level Paschen-Balmer hydrogen line ratios. The use of common upper level line ratios has the advantage of being nearly independent of the excitation condition of the nebula (ne, Te). The line ratio method can be applied in regions where no stars are available for photometry.

Abstract Copyright:

Journal keyword(s): dust, extinction

Simbad objects: 21

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Number of rows : 21
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2023
#notes
1 M 31 G 00 42 44.330 +41 16 07.50 4.86 4.36 3.44     ~ 12095 1
2 NAME SMC G 00 52 38.0 -72 48 01   2.79 2.2     ~ 10530 1
3 NAME LMC G 05 23 34.6 -69 45 22     0.4     ~ 16507 1
4 * tet01 Ori C SB* 05 35 16.4662967280 -05 23 22.921811880 4.20 5.15 5.13 4.91 4.73 O7Vp 1367 1
5 M 42 OpC 05 35 17 -05 23.4           ~ 3970 0
6 NGC 2467 OpC 07 52 18 -26 25.7           ~ 183 1
7 HD 64315 Em* 07 52 20.2841727949 -26 25 46.683038109 8.76 9.49 9.24 9.63 8.86 O5.5Vz+O7V 113 1
8 NGC 3603 OpC 11 15 11 -61 15.5           ~ 1032 1
9 M 51 GiP 13 29 52.698 +47 11 42.93   9.26 8.36 8.40   ~ 4159 4
10 HD 164492 Y*O 18 02 23.5527520992 -23 01 50.999556180 6.49 7.49 6.80 7.52   O7.5Vz 222 0
11 M 20 OpC 18 02 42 -22 58.3           ~ 422 1
12 NGC 6523 Cl* 18 03.2 -24 23           ~ 185 1
13 M 8 HII 18 03 37 -24 23.2           ~ 598 1
14 NAME Her 36SE SB* 18 03 40.3201232304 -24 22 42.857540472 10.26 11.022 10.372 10.267   O8V+ 188 0
15 M 16 OpC 18 18 45 -13 47.5   6.58 6.0     ~ 1006 2
16 NGC 6618 341 ** 18 20 29.862 -16 10 44.93 17.04 16.28 14.13     O4+O4 60 1
17 NGC 6618 337 Y*O 18 20 34.4905832784 -16 10 11.837880948 12.27 12.40 11.29     O4V(n)((fc)) 40 0
18 BD-16 4818 Y*O 18 20 35.3856109704 -16 10 48.509924232 10.62 10.67 10.03 10.02   O8.5V 50 0
19 NGC 6618 OpC 18 20 47 -16 10.3           ~ 1574 0
20 CD-44 12736 PM* 18 36 25.9502475648 -44 18 36.907592904   10.83 10.22     G0 205 0
21 NGC 7027 PN 21 07 01.571952 +42 14 10.47120   10.358 8.831 10.157   ~ 2416 1

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2023.01.27-18:33:43

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