[vsnet-alert 23070] Re: ASASSN-19fd: more time-resolved photometry required

Sun Mar 17 17:14:29 JST 2019

Hi,

Timeseries observations of ASASSN-19fd were done last night at KKO with a 30cm telescope f/8.
The closeness of the OT to a nearby brighter star made it impossible to apply photometry to the OT separately. The derived photometry was done on the blend, with a magnitude of 14.0CR. The magnitudes of the individual stars were estimated to be 14.6CR and 15.5CR for the neighbor star and the OT respectively.

A strongly reduced modulation was shown at a period 
P= 0.0582d +/- 0.0007

Observations with higher resolution telescopes will greatly improve the OT parameters. 

Berto Monard / CBA Kleinkaroo

Sent from Mail for Windows 10

From: Patrick Schmeer pasc1312-aavso at yahoo.de via vsnet-alert
Sent: Saturday, March 16, 2019 10:41 AM
To: vsnet-alert at ooruri.kusastro.kyoto-u.ac.jp; vsnet-outburst at ooruri.kusastro.kyoto-u.ac.jp; cvnet-outburst at yahoogroups.com; baavss-alert at yahoogroups.com
Subject: [vsnet-alert 23069] ASASSN-19fd: more time-resolved photometryrequired

ASASSN-19fd  (UG:)
https://www.aavso.org/vsx/index.php?view=detail.top&oid=686693

Now also detected by Gaia and reported as Gaia19aza
(RA 17 03 19.29, DE -29 52 23.3):
http://gsaweb.ast.cam.ac.uk/alerts/alert/Gaia19aza/

More ASAS-SN Sky Patrol (Shappee et al. 2014ApJ
...788...48S and Kochanek et al. 2017PASP..129j4502K)
observations of this long outburst (superoutburst?):
https://asas-sn.osu.edu/light_curves/c4481545-e735-4fcb-bee3-523693977a9a

ASASSN-19fd 20190310.301 14.38g ASN
ASASSN-19fd 20190310.306 14.39g ASN
ASASSN-19fd 20190311.299 14.55g ASN
ASASSN-19fd 20190311.302 14.55g ASN
ASASSN-19fd 20190312.281 14.69g ASN
ASASSN-19fd 20190312.304 14.61g ASN
ASASSN-19fd 20190313.276 14.74g ASN
ASASSN-19fd 20190313.300 14.68g ASN
ASASSN-19fd 20190314.286 14.85g ASN
ASASSN-19fd 20190314.295 14.86g ASN
ASASSN-19fd 20190315.273 14.91g ASN
ASASSN-19fd 20190315.295 14.99g ASN
ASASSN-19fd 20190316.301 15.09g ASN
ASASSN-19fd 20190316.326 14.99g ASN

Josch Hambsch has already reported 128 observations
(from 2019 Mar. 9.307 to 14.392 UT) to AAVSO, but no
analysis has yet been provided:
https://www.aavso.org/apps/webobs/results/?star=ASASSN-19fd

*** Time-resolved photometry is still required. ***

Clear skies,
Patrick