2014A&A...565A..36U


C.D.S. - SIMBAD4 rel 1.7 - 2019.11.15CET12:35:03

2014A&A...565A..36U - Astronomy and Astrophysics, volume 565A, 36-36 (2014/5-1)

The Herschel Planetary Nebula Survey (HerPlaNS). I. Data overview and analysis demonstration with NGC 6781.

UETA T., LADJAL D., EXTER K.M., OTSUKA M., SZCZERBA R., SIODMIAK N., ALEMAN I., VAN HOOF P.A.M., KASTNER J.H., MONTEZ R.Jr, McDONALD I., WITTKOWSKI M., SANDIN C., RAMSTEDT S., DE MARCO O., VILLAVER E., CHU Y.-H., VLEMMINGS W., IZUMIURA H., SAHAI R., LOPEZ J.A., BALICK B., ZIJLSTRA A., TIELENS A.G.G.M., RATTRAY R.E., BEHAR E., BLACKMAN E.G., HEBDEN K., HORA J.L., MURAKAWA K., NORDHAUS J., NORDON R. and YAMAMURA I.

Abstract (from CDS):

This is the first of a series of investigations into far-IR characteristics of 11 planetary nebulae (PNe) under the Herschel Space Observatory open time1 program, Herschel Planetary Nebula Survey (HerPlaNS). Using the HerPlaNS data set, we look into the PN energetics and variations of the physical conditions within the target nebulae. In the present work, we provide an overview of the survey, data acquisition and processing, and resulting data products. We performed (1) PACS/SPIRE broadband imaging to determine the spatial distribution of the cold dust component in the target PNe and (2) PACS/SPIRE spectral-energy-distribution and line spectroscopy to determine the spatial distribution of the gas component in the target PNe. For the case of NGC6781, the broadband maps confirm the nearly pole-on barrel structure of the amorphous carbon-rich dust shell and the surrounding halo having temperatures of 26-40K. The PACS/SPIRE multiposition spectra show spatial variations of far-IR lines that reflect the physical stratification of the nebula. We demonstrate that spatially resolved far-IR line diagnostics yield the (Te, ne) profiles, from which distributions of ionized, atomic, and molecular gases can be determined. Direct comparison of the dust and gas column mass maps constrained by the HerPlaNS data allows to construct an empirical gas-to-dust mass ratio map, which shows a range of ratios with the median of 195±110. The present analysis yields estimates of the total mass of the shell to be 0.86M, consisting of 0.54M of ionized gas, 0.12M of atomic gas, 0.2M of molecular gas, and 4x10–3M of dust grains. These estimates also suggest that the central star of about 1.5M initial mass is terminating its PN evolution onto the white dwarf cooling track. The HerPlaNS data provide various diagnostics for both the dust and gas components in a spatially resolved manner. In the forthcoming papers of the HerPlaNS series we will explore the HerPlaNS data set fully for the entire sample of 11 PNe.

Abstract Copyright:

Journal keyword(s): infrared: stars - planetary nebulae: general - stars: winds, outflows - stars: mass-loss - planetary nebulae: individual: NGC 6781 - circumstellar matter

Simbad objects: 14

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Number of rows : 14

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2020
#notes
1 NGC 40 PN 00 13 01.0170260109 +72 31 19.032886305   11.63 11.46     [WC8] 582 2
2 M 76 PN 01 42 19.6604707683 +51 34 31.553132974     17.48   17.69 DOZ 356 2
3 NAME Magellanic Clouds GrG 03 00 -71.0           ~ 5386 1
4 NGC 2392 PN 07 29 10.7669120392 +20 54 42.478515772   10.28 9.68     O6f 690 0
5 NGC 3242 PN 10 24 46.1335198512 -18 38 32.294434711   11.83 12.15     ~ 790 1
6 PN Mz 3 PN 16 17 13.3911453558 -51 59 10.706640574   10.8 14.00     O9.5 330 0
7 NGC 6445 PN 17 49 15.21 -20 00 34.5   18.9       ~ 284 0
8 NGC 6543 PN 17 58 33.4042519454 +66 37 58.748961810   11.09 11.28     [WC] 1107 1
9 M 57 PN 18 53 35.0969571234 +33 01 44.883146221   15.405 15.769 15.901 16.062 DA(O?) 784 2
10 NGC 6781 PN 19 18 28.085 +06 32 19.29     11.8     ~ 245 0
11 NGC 6826 PN 19 44 48.1500835472 +50 31 30.250916761   10.21 9.6     O6fp 693 0
12 NGC 7009 PN 21 04 10.8153350719 -11 21 48.581808296   12.48 12.07     ~ 951 1
13 NGC 7026 PN 21 06 18.5721833093 +47 51 06.780221314   15.33 15.1     [WC3] 403 1
14 NGC 7293 PN 22 29 38.5453078023 -20 50 13.746093105 11.894 13.158 13.524 13.689 13.898 DAO.5 883 0

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2019.11.15-12:35:03

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