px #ccc solid;padding-left:1ex">
Sziasztok!



A Nova Del sz=E9pen halv=E1nyodik. Tegnapel=F5tt m=E1r csak n=E9h=E1ny tize=
ddel l=E1ttam

f=E9nyesebbnek 6 magnin=E1l.



Santangelo =E9s t=E1rsai szerint naponta 0,25 magnit halv=E1nyodik, ebb=F5l=
az

j=F6tt ki nekik, hogy a Nova Del 2013 eset=E9n t2=3D8 nap. Ez alapj=E1n a N=
ova Del

2013 abszol=FAt f=E9nyess=E9g=E9re Mv ~ -9,3 j=F6tt ki, majd a v=F6r=F6s=F6=
d=E9st =E9s

egyebeket is =A0figyelbe v=E9ve arra jutottak, hogy Mv ~ 8,9 a n=F3va t=E9n=
yleges

abszol=FAt f=E9nyess=E9ge. Ebb=F5l 3,5kpc t=E1vols=E1g j=F6n ki, vagyis ha =
j=F3l sz=E1molom,

kb. 120 ezer f=E9ny=E9vnyi t=E1vols=E1g.



* * *



ATEL #5313





Title: =A0Distance of nova Del 2013 from MMRD relations

Author: M. M.M. Santangelo, M. Pasquini, S. Gambogi, G. Cavalletti

=A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 (OAC - Osservatorio Astronomico di Capannor=
i and IRF - Istituto Ricerche

=A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 Fotometriche, Italy)

Queries: =A0 =A0 =A0 =A0 cvml', 's3m@irf.lu.it')">s3m@irf.lu.it

Posted: 23 Aug 2013; 15:56 UT

Subjects:Optical, Nova



Following ATEL 5295, in the course of the CATS (Capannori Astronomical

Transients Survey) project, M.M.M. Santangelo and co-workers performed

more UBVR photoelectric photometry and low resolution CCD long-slit

spectrometry

of nova Delphini 2013.

The measurements were made with an Optec SSP-5A single channel photoelectri=
c

photometer (with a photomultiplier tube Hamamatsu R6358), and with a SBIG r>
SGS spectrometer + CCD camera ST-7XME attached to the 0.30-m f/10

Schmidt-Cassegrain

telescope at Osservatorio Astronomico di Capannori (OAC).

The atmospheric extinction was measured each night with the method of

Bouguer's

lines.

As comparison stars for the photometry we used HD 194113 (UBV measurements)=


and GSC 1644-1837 (BVR measurements).

Pre-processing of the spectra included bias + dark + nightsky subtraction.<=
br>


The spectra were wavelength calibrated by means of Mercury and Neon lamps r>
taken immediately after each nova spectrum, and they were flux calibrated r>
by means of spectra of the spectrophotometric standard star Zeta Peg taken<=
br>
in the same night at a similar airmass of nova ones.

These spectra of nova Delphini 2013 were taken in two spectral ranges from<=
br>
385.4 to 715.2 nm and from 591.0 to 920.8 nm, at the dispersion of 0.43

nm/pixel (resolution R ~ 1000), through a 18 microns wide long-slit.

Our photoelectric photometry shows that, after the end of a short

post-maximum

plateau, the V band light curve is fading linearly at a constant rate of >
0.250 +/- 0.008 mag/day.

If this slope will remain constant for the following two days we expect

the nova should have reached the 2 magnitudes below level at maximum around=


Julian Day 2456529.5 .

This would lead to a time t2 ~ 8.5 +/- 0.3 days (assuming as t-max the

Julian Day 2456521.0 at V =3D 4.35 +/- 0.03, from AAVSO data).

Using the nonlinear Mv-log(t2) relation of Downes & Duerbeck (2000, AJ<=
br>
120, p.2007) this implies an absolute magnitude of Mv ~ -9.3 +/- 0.2 .



The E(B-V) was estimated to be 0.17 from ATEL 5288 and 0.182 from ATEL

5297, leading to Av respectively of 0.53 and 0.56 mags; from the NED

extinction

calculator we get other two estimates for Av: 0.49 and 0.60 mags.

We adopted a mean value of Av =3D 0.55 +/- 0.1 mags.

So the distance of the nova is d ~ 4.2 +/- 0.4 kpc

Using the linear Mv-log(t2) relation of Downes & Duerbeck (2000, AJ 120=
,

p.2007) a t2 =3D 8.5 implies an absolute magnitude of Mv ~ -8.9 +/- 0.2. >


So, ceteris paribus, the distance changes to d ~ 3.5 +/- 0.4 kpc.

As a final preliminary estimate, we can adopt a value around 4 kpc (or

a bit less) for the distance of the nova DEL 2013.

Our spectra of nova Delphini 2013, taken in the last few days, showed no >
more P Cyg effect but simple emission lines of H-alpha, H-beta, H-gamma, >
OI 777.4 nm, and various Fe II.



---------------------------------------------------------------------------=
---

Password Certification: Filippo Mannucci ( =3D"_e(event, 'cvml', 'filippo@arcetri.astro.it')">filippo@=
arcetri.astro.it)

k">http://www.astronomerstelegram.org/?read=3D5313



* * *



=FCdv:



--

FIDRICH Robert (Fidusz)

MTVSZ/FoE Hungary

drotlevel/email: 9;, 'fidusz@zpok.hu')">fidusz@zpok.hu

#jabber/gtalk: , 'fidusz@jabber.hu')">fidusz@jabber.hu



________________________________________________________________________ >
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Hozz=E1sz=F3l=E1sok: l', 'Mira@mcse.hu')">Mira@mcse.hu

Listakezel=F5 utas=EDt=E1sok: 'cvml', 'Mira-request@mcse.hu')">Mira-request@mcse.hu<=
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