[vsnet-alert 23468] Re: Atel #13010: Low-resolution spectroscopy of the long-orbital period dwarf nova candidate ASASSN-19rx

Keisuke Isogai isogai at kusastro.kyoto-u.ac.jp
Fri Aug 9 18:57:55 JST 2019


Dear Josch,

I'm so sorry for forgetting photometric observers.
Because what I did is only to perform a spectroscopic observation,
it slipped my mind. I will be careful about it.

> The links to the spectrum and the VSNET e-mails are not working as well.
I (and some persons) cannot confirm it.
I guess that it is a temporal server error or something.

Best regards,
Keisuke Isogai

On 2019/08/09 18:22, Josch Hambsch wrote:
> Dear Isogai-san,
>
> Of course it is a pity that you have not taken up the contributors to time series of ASASSN-19rx, which showed clearly the eclipses in your ATEL. The links to the spectrum and the VSNET e-mails are not working as well.
>
> Regards,
> Josch
>
> -----Original Message-----
> From: vsnet-alert [mailto:vsnet-alert-bounces at ooruri.kusastro.kyoto-u.ac.jp] On Behalf Of Keisuke Isogai
> Sent: Freitag, 9. August 2019 10:49
> To: vsnet-alert at ooruri.kusastro.kyoto-u.ac.jp; vsnet-outburst at ooruri.kusastro.kyoto-u.ac.jp
> Subject: [vsnet-alert 23466] Atel #13010: Low-resolution spectroscopy of the long-orbital period dwarf nova candidate ASASSN-19rx
>
> I posted the following Atel about ASASSN-19rx:
> http://www.astronomerstelegram.org/?read=13010
>
> -----------------------------------------------
>
> Low-resolution spectroscopy of the long-orbital period dwarf nova candidate ASASSN-19rx
>
> ATel #13010; Keisuke Isogai, Taichi Kato, Naoto Kojiguchi, Daisaku Nogami, Masaaki Otsuka, Masayuki Yamanaka (Kyoto University) on 9 Aug 2019; 08:43 UT Credential Certification: Keisuke Isogai (isogai at kusastro.kyoto-u.ac.jp)
>
> Subjects: Optical, Binary, Cataclysmic Variable, Transient, Variables
>
> ASASSN-19rx was discovered on 2019-07-21.02 UT by the All-Sky Automated Survey for Supernovae (ASAS-SN; <a href="http://adsabs.harvard.edu/abs/2014ApJ...788...48S">Shappee et al. 2014</a>, <a href="http://adsabs.harvard.edu/abs/2017PASP..129j4502K">Kochanek et al. 2017</a>). Although the ASAS-SN website indicated that this object shows an "unusual slow stellar outburst", we confirmed that its spectrum is a characteristic of a dwarf nova outburst.
>
> The archive data of the ASAS-SN Sky Patrol shows a long (~2 months) and small
> (~1 mag) outburst in 2015. In addition, the Gaia color and absolute magnitude are respectively redder and brighter than those of ordinary dwarf novae.
> Thus, it is proposed that this object is a candidate for a long-orbital period dwarf nova such as V630 Cas or BD Pav (vsnet-alert 23415).
> Furthermore, we have found that the object is eclipsing and identified the period of ~2.5 d  (vsnet-alert 23460).
> Thus this object is likely to be a kind of such rare objects.
>
> We report on an optical low-resolution spectrum of ASASSN-19rx.
> The data was obtained on 2019-07-30.77 UT by fiber-fed integral field spectrograph (KOOLS-IFU; <a href="http://adsabs.harvard.edu/abs/2019arXiv190505430M">Matsubayashi et al. 2019</a>) mounted on the 3.8-m telescope Seimei at Okayama Observatory of Kyoto University.
> The obtained spectrum ( http://www.kusastro.kyoto-u.ac.jp/~isogai/atel/asassn-19rx/asassn-19rx_spectrum.png ) shows the Balmer, HeI, HeII and CIII/NIII emission lines.
> The emission lines are shifted by +100--200 km/s.
> It is remarkable that the HeII 4688 is very strong whereas HeI lines are relatively weak.
> Such features are also observed in some other long-orbital period dwarf novae (<a href="http://adsabs.harvard.edu/abs/2018PASJ...70...78K">Kimura et al. 2018</a>).
> Although this system should have an accretion disk, all emission lines have single peaked profiles.
> We are planning to observe the line-profile variations through the orbital period and outburst cycle.
> Observations at other wavelengths are encouraged.
>
>
> ---
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