WUMaCat

Simbad link	HI Dra
Source publication	Çalışkan, Ş. (2014) - Photometric Analysis of Overcontact Binaries AK Her, HI Dra, V1128 Tau, and V2612 Oph
ADS link	2014AJ....148..126C
Name in Source publication	HI Dra
Orbital period in days (P [d])	0.597423
Mass ratio (q)	0.25
Mass ratio determination	Spectroscopic
Type	A
Has total eclipse?
Has spots?
Has third light?
Has period variation?

Solver	DC
Orbital period in days (P [d])	0.597423
Mass ratio (q)	0.25
Orbital inclination in degrees (i [^o])	54.7
Fillout (f)	0.23
Primary temperature in Kelvins (T₁ [K])	7000
Secondary temperature in Kelvins (T₂ [K])	6550
Primary polar radius in units of orbital separation (r_1p)	0.4782
Secondary polar radius in units of orbital separation (r_2p)	0.2569
Surface potential (Ω)	2.3167

Orbital separation in solar radii (a [R])	3.8
Primary radius in solar units (R₁ [R])	1.97
Secondary radius in solar units (R₂ [R])	1.07
Primary mass in solar units (M₁ [M])	1.7
Secondary mass in solar units (M₂ [M])	0.42
Primary temperature in kelvins (T₁ [K])	7000
Secondary temperature in Kelvins (T₂ [K])	6550
Primary luminosity in solar units (L₁ [L])	7.87
Secondary luminosity in solar units (L₂ [L])	1.8
Distance in parsecs (d [pc])
Age in gigayears (τ [gyr])	2.84

HI Dra