2006ApJ...636.1045L


C.D.S. - SIMBAD4 rel 1.7 - 2021.05.18CEST04:29:40

2006ApJ...636.1045L - Astrophys. J., 636, 1045-1053 (2006/January-2)

Raman-scattered He II λλ4850, 6545 in the young and compact planetary nebula IC 5117.

LEE H.-W., JUNG Y.-C., SONG I.-O. and AHN S.-H.

Abstract (from CDS):

We report the discovery of He II λλ4850 and 6545 Raman-scattered by atomic hydrogen in the high-resolution spectrum of the very compact and young planetary nebula IC 5117 obtained with the ESPaDOnS (Echelle Spectropolarimetric Device for the Observation of Stars) installed on the 3.6 m Canada-France-Hawaii Telescope. By adopting case B recombination atomic data and considering all the fine-structure emission components, we calculate the weighted averages for the line centers of the Raman-scattered features, as well as those for the emission lines He II λλ4859 and 6560 to determine redward velocity shifts of Δv4850=+29 km/s and Δv6545=+24 km/s. We compute the Raman conversion efficiency by a Monte Carlo technique adopting a simple scattering geometry, in which the hot central star is surrounded by a hollow cylindrical H I region characterized by thickness T that is in turn parameterized by the H I column density. It is proposed that the central far-UV emission region is covered significantly by the neutral scattering region characterized by the H I column density N_HI_≃4x1021/cm2. The H I column density is higher by an order of magnitude than the value proposed from 21 cm radio observations. We briefly discuss the importance of Raman scattering as a probe of neutral material around a newly formed hot white dwarf and the mass-loss process occurring in the late stage of stellar evolution.

Abstract Copyright:

Journal keyword(s): Line: Profiles - ISM: Planetary Nebulae: General - ISM: Planetary Nebulae: Individual: Alphanumeric: IC 5117 - Radiative Transfer - Scattering

Simbad objects: 8

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Number of rows : 8

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2021
#notes
1 PN M 2-9 PN 17 05 37.952 -10 08 34.58   12.59 14.7     Be 507 0
2 NGC 6302 PN 17 13 44.339 -37 06 10.95   7.1 10.10     ~ 762 1
3 V* HM Sge Sy* 19 41 57.0758884476 +16 44 39.856454738   12.38 11.10     M7 439 1
4 EM* AS 373 Sy* 19 57 05.0184580246 +39 49 36.085051314     11.50   10.592 M6/8e 571 0
5 V* RR Tel Sy* 20 04 18.5382966387 -55 43 33.154224077 9.93 11.33 10.81     WN3-6.5+M3.5-7 519 0
6 IC 4997 PN 20 20 08.7615653034 +16 43 53.993812400   11.94 11.15     [WC7/8] 530 0
7 NGC 7027 PN 21 07 01.571952 +42 14 10.47120   10.358 8.831 10.157   ~ 2358 1
8 IC 5117 PN 21 32 30.97 +44 35 47.5     16.7     ~ 291 0

    Equat.    Gal    SGal    Ecl

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2021.05.18-04:29:40

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