PX Cep: erster Nachweis des sekundären Minimums

PX Cep

Author: Norbert Reichmann

published project

PX Cep in its sorrounding deep-sky field, observed over a time span of 168 days, 512 data were collected in 18 nights

     PX Cep: beobachtet über eine Zeitspanne von 168 Tagen, 512 Daten wurden in 18 Nächten gewonnen

lightcurve B

Author: Norbert Reichmann

lightcurve V

Author: Norbert Reichmann

lightcurve Rc

Author: Norbert Reichmann

secondary minima  V

Author: Norbert Reichmann

secondary minima  Rc

Author: Norbert Reichmann

colour index (B - V)

Author: Norbert Reichmann

signed system

Author: Norbert Reichmann

simulated system

Author: Norbert Reichmann

surface outlines

Author: Norbert Reichmann

 

hand solution

Author: Norbert Reichmann

yellow: observed, read from the lightcurve; red: calculated rg=radius greater- rs=radius smaller star, i= inclination

      gelb: beobachtet, rot: berechnet rg=Radius größerer-, rs=rRadius kleinerer Stern, i=Sichtwinkel des Systems

BM3 solution

see here for parameters

calculated data (line) created by BM3  covers  the observed data (points) in the

B curve

V curve

Rc curve

information

Veränderlichen-Typ: EA (long amplitude Eclipsing Algol-type variable)
Minima:

primäre Minima V: 

JD 2456520.3868, 2013.08.15  UT 21:17:01  +/-0.0097d

JD 2456523.5137, 2012.08.09  UT 00:19:44  +/-0.0097d

JD 2456592.3053, 2012.10.26  UT 19:19:34  +/-0.0097d

sekundäres Minimum:         Phase 0.5

Magnituden:

B:   Min = 15.27 mag,  Max = 12.38  mag,  Delta mag = 2.89 mag

V:   Min = 14.46 mag,  Max = 12.10  mag,  Delta mag = 2.36 mag

Rc: Min = 13.80 mag,  Max = 11.92  mag,  Delta mag = 1.88 mag

Farbindex (B-V): primäres Min 0.920; sekundäres Min 0.236
Periode: 3.126889d  +/-0.000035d
Epoche:

Min I HJD = 2446270.440 + 3.126993  * E (Boninsegna 1987)

Min I HJD = 2446680.402 + 3.126905  * E (Borovicka 1995)

Min I HJD = 2456520.386 + 3.126889  * E (own data)

Bemerkungen:

Erster Nachweis des sekundären Minimums; reflection effect

first detection of secondary minima

Vergleichssterne RA, Dec:

B,V,Rc: RA: 21 36 20,71 Dec: +65 49 51,5   12.81mag (B-V) 0.650

             RA: 21 36 53,62 Dec: +65 51 11,1   12.10mag (B-V) 0.525 

             RA: 21 35 39,74 Dec: +65 49 35,5   13.84mag (B-V) 0.652

Teleskop: LZOS TMB Apo 130/1200
Kamera: Apogee  Alta U16M
Filter: B, V, Rc (Johnson/Cousins)
Belichtungszeiten: B: 300sec, 420sec   V:  300sec, 420sec;  Rc:  300sec, 420sec;  
Messpunkte: B: 139;  V: 219;  Rc 152;  510 data
Auswertung:

MPO Canopus 

Periodenbestimmung mit Hilfe der Fourier-Analyse nach dem Algorithmus von Allen Harris

Mittlerer Fehler:

B: 0.014mag;  V: 0.01mag;  Rc: 0.032mag
Beobachter:

Norbert Reichmann

norbert.reichmann&startime.at