J/ApJ/916/44 Subaru/HDS spectra of V5669 Sgr (Arai+, 2021)
Detection of 7BeII in the classical nova V5669 Sgr (Nova Sagittarii 2015 No.3)
Arai A., Tajitsu A., Kawakita H., Shinnaka Y.
<Astrophys. J., 916, 44 (2021)>
=2021ApJ...916...44A 2021ApJ...916...44A
ADC_Keywords: Novae; Spectra, ultraviolet; Spectra, optical
Keywords: Classical novae ; Nuclear abundances ;
Cataclysmic variable stars ; Galaxy chemical evolution ;
Spectroscopy ; High resolution spectroscopy
Abstract:
We report the new detection of 7BeII in the ultraviolet spectra of
V5669 Sgr during its early decline phase (+24 and +28d). We identified
three blueshifted absorption systems in our spectra. The first two,
referred to as low- and high-velocity components, were noticeably
identified among HI Balmer, NaI D, and FeII whose lower energies of
transients are low (<4eV). The third absorption component was
identified among NII, HeI, and CII lines whose lower energy levels are
relatively high (9-21eV). The absorption lines of 7BeII at
3130.583Å and 3132.228Å were identified as the first and second
components in our observations. No evidence suggested the existence of
LiI at 6708Å in any velocity components. The estimated number
density ratio of lithium relative to hydrogen, which was finally
produced by this object using the equivalent widths of 7Be and CaII
K, N(7Li)/N(H)final, is 4.0±0.7x10-6. This value is an order
of magnitude lower than the average observed values for classical
novae wherein 7Be has been detected, and is comparable to the most
optimistic value of theoretical predictions.
Description:
We performed optical high dispersion spectroscopic observations for
V5669 Sgr using the High Dispersion Spectrograph (HDS) mounted on the
8.2m Subaru telescope and succeeded at two epochs (+24 and +28d)
during its rapid decline phase. Table 2 shows a summary of our HDS
observations. The spectral resolving power was ∼45000 with a 0.80"
(0.4mm) slit width.
Objects:
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RA (ICRS) DE Designation(s)
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18 03 32.74 -28 16 05.5 V5669 Sgr = Gaia DR2 4062508582302805760
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File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table2.dat 62 4 Journal of observations of V5669 Sgr by
Subaru/HDS
sp/* . 4 Individual spectra in FITS format
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See also:
B/gcvs : General Catalogue of Variable Stars (Samus+, 2007-2017)
B/vsx : AAVSO International Variable Star Index VSX (Watson+, 2006-)
J/other/IBVS/6155 : 81th name-list of variable stars. II. (Kazarovets+, 2015)
J/ApJ/830/30 : HDS spectrum of nova V2659 Cyg (Nova Cyg 2014) (Arai+, 2016)
J/ApJ/910/120 : Dwarf nova outbursts detected by ASAS-SN (Kawash+, 2021)
J/A+A/647/A169 : VVV survey near-infrared colour catalogue (Herpich+, 2021)
Byte-by-byte Description of file: table2.dat
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Bytes Format Units Label Explanations
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1- 11 A11 "Y/M/D" Date Date of observation (UT)
13- 20 F8.2 d MJD [57318.19/57322.22] Modified Julian Date
22- 27 F6.2 d t [24.09/28.12] Days after tmax
(2015 Sep 29.1; MJD57294.1)
29- 30 A2 --- Setup Setup ("Ub" or "Yb") (1)
32- 35 I4 s Exp [1800/3000] Exposure time
37- 40 F4.2 --- Airmass [1.88/2.59] Airmass
42- 62 A21 --- File Name of the FITS file in subdirectory "sp";
column added by CDS
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Note (1): Our spectra cover 3020-6865Å with two different grating settings
of the spectrograph: Setup-Ub, 3020-4631Å with a gap at 3748-3790Å,
and Setup-Yb, 4108-6865Å with a gap at 5434-5514Å.
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History:
From electronic version of the journal
(End) Emmanuelle Perret [CDS] 22-Dec-2022