J/ApJS/259/56 2mm and 3mm sp. of CRL 2688 protoplanetary nebula (Qiu+, 2022)
Molecules in the carbon-rich protoplanetary nebula CRL 2688.
Qiu J.-J., Zhang Y., Zhang J.-S., Nakashima J.-I.
<Astrophys. J. Suppl. Ser., 259, 56 (2022)>
=2022ApJS..259...56Q 2022ApJS..259...56Q
ADC_Keywords: Planetary nebulae; Spectra, millimetric/submm
Keywords: Molecular gas ; Molecular spectroscopy ; Circumstellar matter ;
Protoplanetary nebulae ; Circumstellar envelopes ;
Circumstellar gas ; Circumstellar shells
Abstract:
We present observations of the carbon-rich protoplanetary nebula
CRL2688 made with the Institut de Radioastronomie Millimetrique 30m
telescope in the 3 and 2mm bands. In total, 196 transition lines
belonging to 38 molecular species and isotopologues are detected,
among which, to the best of our knowledge, 153 transition lines and
13 species are the first reported for this object. Additionally, in
order to contribute to future research, we have collected
observational data on the molecular lines of CRL 2688 from the
literature and compiled them into a single unified catalog. We find
that the molecular abundance of CRL 2688 cannot be explained by the
standard model of a circumstellar envelope. The implications of
metal-bearing molecules on circumstellar chemistry are discussed.
Description:
The observations toward the central region of CRL 2688
(RAJ2000=21:02:18.27,DEJ2000=36:41:37.0) were performed with the
Institut de Radioastronomie Millimetrique (IRAM) 30m diameter
telescope at the Pico Veleta Observatory (Spain) on 2017 January 14.
We used the Eight Mixer Receiver (EMIR) with dual polarization and the
Fourier Transform Spectrometers (FTS) backend to cover frequency
ranges of 75.7-83.5GHz and 91.4-99.2GHz in the 3mm window and
160.8-168.6GHz and 176.5-184.3GHz in the 2mm window.
Objects:
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RA (ICRS) DE Designation(s)
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21 02 18.27 +36 41 37.0 CRL 2688 = RAFGL 2688
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File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
fig1.dat 20 159340 The full spectra of CRL 2688 obtained in
current observations
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See also:
B/eso : ESO Science Archive Catalog (ESO, 1991-2022)
VI/139 : Herschel Observation Log (Herschel Science Centre, 2013)
J/A+A/299/755 : Stellar evolution. II. Post-AGB (Bloecker+, 1995)
J/A+A/432/369 : Leiden Atomic and Molecular Database (LAMDA) (Schoeier+, 2005)
J/ApJ/661/250 : Molecular line survey of CRL 618 (Pardo+, 2007)
J/ApJS/177/275 : 1.3 and 2mm survey of IRC+10216 (He+, 2008)
J/ApJ/700/1299 : Gas-phase element depletions in the ISM (Jenkins, 2009)
J/ApJ/709/1042 : Variability in C-rich proto-PNe. (Hrivnak+, 2010)
J/ApJS/193/17 : Spectral-line survey of IRC+10216 at 293-355GHz (Patel+, 2011)
J/A+A/574/A56 : IRC +10216 17.8GHz-26.3GHz spectrum (Gong+, 2015)
J/A+A/606/A74 : IRC +10216 13.3GHz-18.5GHz spectrum (Zhang+, 2017)
J/A+A/633/A120 : SgrB2(M) 13CCC and C13CC spectra (Giesen +, 2020)
J/A+A/634/A125 : NGC 1068 nucleus molecular line spectra at 2mm (Qiu+, 2020)
J/AJ/162/191 : 2011-2021 calibrator observations of SCUBA-2 (Mairs+, 2021)
Byte-by-byte Description of file: fig1.dat
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Bytes Format Units Label Explanations
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1- 10 F10.6 GHz Freq [75.7/184.3] Rest frequency
12- 20 E9.2 K Tmb [-0.25/11.8] Main beam temperature (1)
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Note (1): The antenna temperature (TA) is converted to the main-beam
temperature (Tmb) with the expression of Tmb=TAx(Feff/Beff),
where the forward efficiency (Feff) and main-beam efficiency (Beff)
of the telescope at each band (taken from the IRAM website)
are listed in Table 2:
----------------------------------------------
Band range Feff Beff HPBW
(GHz) (arcsec)
----------------------------------------------
75.70-83.48 95 81 32.5-29.5
91.38-99.16 95 81 26.9-24.8
160.84-168.62 93 73 15.3-14.6
176.52-184.30 94 63 13.9-13.3
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History:
From electronic version of the journal
(End) Prepared by [AAS], Emmanuelle Perret [CDS] 30-Jun-2022