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J/A+A/607/A78    APEX and IRAM spectra of CK Vul (Nova 1670)   (Kaminski+, 2017)

Organic molecules, ions, and rare isotopologues in the remnant of the stellar-merger candidate, CK Vulpeculae (Nova 1670). Kaminski T., Menten K.M., Tylenda R., Karakas A., Belloche A., Patel N.A. <Astron. Astrophys. 607, A78 (2017)> =2017A&A...607A..78K (SIMBAD/NED BibCode)
ADC_Keywords: Novae ; Spectroscopy Keywords: atlases - stars: mass-loss - stars: peculiar - submillimeter: stars - stars: individual: CK Vul - circumstellar matter Abstract: CK Vulpeculae (CK Vul) is an enigmatic star whose outburst was observed in 1670-72. A stellar-merger event was proposed to explain its ancient eruption. We aim to investigate the composition of the molecular gas recently discovered in the remnant of CK Vul. Deriving the chemical, elemental, and isotopic composition is crucial for identifying the nature of the object and obtaining clues on its progenitor(s). We observed millimeter and submillimeter-wave spectra of CK Vul using the IRAM 30m and APEX telescopes. Radiative-transfer modeling of the observed molecular features was performed to yield isotopic ratios for various elements. The spectra of CK Vul reveal a very rich molecular environment of low excitation (Tex~<12K). Atomic carbon and twenty seven different molecules, including two ions, were identified. They range from simple diatomic to complex polyatomic species of up to seven atoms large. The chemical composition of the molecular gas is indicative of carbon and nitrogen-driven chemistry but oxides are also present. Additionally, the abundance of F may be enhanced. The spectra are rich in isotopologues that are very rare in most known sources. All stable isotopes of C, N, O, Si, and S are observed and their isotopic ratios are derived. The composition of the remnant's molecular gas is most peculiar and gives rise to a very unique millimeter and submillimeter spectrum. The observation of ions and complex molecules suggests the presence of a photoionizing source but its nature (a central star or shocks) remains unknown. The elemental and isotopic composition of the gas cannot be easily reconciled with standard nucleosynthesis but processing in hot CNO cycles and partial He burning can explain most of the chemical peculiarities. The isotopic ratios of CK Vul are remarkably close to those of presolar nova grains but the link of Nova 1670 to objects responsible for these grains is unclear. Description: The catalogue contains millimetre and submillimetre spectra of the remnant of the stellar-merger candidate, CK Vul (or Nova 1670). The spectra were obtained in 2014-2017 with the 12-m APEX and 30m IRAM telescopes. The position at RA=19:47:38.0 and DE=+27:18:48.0 (J2000) was observed, close to the central part of the remnant and ∼3 arcsec away from the radio continuum source. Spectra were corrected for baseline. Features produced by the interstellar medium and some telluric bands were removed. Spectra were rebinned to 6MHz. The data are stored here in the FITS format that is compatible with the GILDAS/CLASS package. Objects: -------------------------------------------------- RA (2000) DE Designation(s) -------------------------------------------------- 19 47 38.0 +27 18 48 CK Vul = NOVA Vul 1670 -------------------------------------------------- File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file list.dat 130 4 List of fits spectra fits/* 0 4 Individual fits spectra
Byte-by-byte Description of file: list.dat
Bytes Format Units Label Explanations
1- 9 F9.5 deg RAdeg Right Ascension of center (J2000) 10- 18 F9.5 deg DEdeg Declination of center (J2000) 20- 25 I6 --- Nx Number of pixels along X-axis 27- 49 A23 --- Obs.Date Observation date (YYYY-MM-DDThh:mm:ss.sss) 51- 62 E12.6 Hz bFreq Lower value of frequency interval 64- 74 E11.6 Hz BFreq Upper value of frequency interval 76- 82 I7 Hz dFreq Frequency resolution 84- 86 I3 Kibyte size Size of FITS file 88-100 A13 --- FileName Name of FITS file, in subdirectory fits 102-130 A29 --- Title Title of the FITS file
Acknowledgements: Tomasz Kaminski, tkaminsk(at)cfa.harvard.edu
(End) Patricia Vannier [CDS] 08-Aug-2017
The document above follows the rules of the Standard Description for Astronomical Catalogues.From this documentation it is possible to generate f77 program to load files into arrays or line by line

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