New analysis of the light time effect in TU Ursae Majoris

Home

All issues

Volume 589 (May 2016)

A&A, 589 (2016) A94

Full HTML

Free Access

Table 3

Parameters determined previously (left) and our results (right) for the system TU UMa.

Study	Saha & White (1990a)	Kiss et al. (1995)	Wade et al. (1999) ^C	Model 1	Model 2

P_puls(M₀) [d]	0.5576581097	0.5576581097	0.55765817(29)^D	0.557657598	0.557657477
M₀ [HJD]	2 425 760.4364	2 425 760.4364	2 425 760.464(5)^D	2 442 831.4869	2 442 831.4864
Ṗ _puls	×	−31.48^∗	−10.4(7)^∗
10^-11[d d^-1]	×	−31.48^∗	−10.4(7)^∗
a₃ = 1/2 P_pulsṖ_puls	×	−8.78^∗	−2.9(2)
10^-11[d cycle^-1]	×	−8.78^∗	−2.9(2)
β = Ṗ_puls [ms yr^-1]	×	−9.934^∗	−3.3(2)^∗
β = Ṗ_puls [d Myr^-1]	×	−0.11498^∗	−0.038(3)^∗
P_orbit [yr]	20.19^∗	24.1(3)^∗	23.27(24)^∗	23.30	23.27
T₀ [HJD]	2 425 000^∗	2 447 200(50)	2 421 585(207)	2 447 092	2 447 124
e	0.970	0.90(5)	0.74(10)	0.663	0.686
ω [°]	196.1^∗	178(3)	183(5)^∗	181.3	184.1
A [light day]	0.056	0.023(5)^∗	0.0203(35)^∗	0.0168	0.0172
a₁sini [au]	10	4.0(7)^∗	3.52(61)	2.91	2.99
f(M) [M_⊙]	−	0.11(1)	0.080	0.046	0.049
M_2,min ^∗ [M_⊙]	−	0.17	−	0.327	0.339
K₁ [km s^-1]	60.7^∗	11.4(5)	6.6	4.97	5.25
	−	−	−	1.05(9)	1.03(10)
N _max	~ 43	~ 42	67	253	220

Notes. The mass limit of the second body was estimated from the mass function f(M), the orbit inclination (i = 90°), and the mass of the RR Lyrae star M₁ = 0.55 M_⊙ adopted from Fernley (1993) and Skarka (2014). Our parameters (right part of the table) were calculated from all maxima timings for model 1 and only from photoelectric, CCD, and DSLR measurements for model 2.

^(*)

Parameter calculated using values from the original study;

^(C)

their approach C was selected;

^(D)

pulsation elements are known only from their approach D.

Current usage metrics show cumulative count of Article Views (full-text article views including HTML views, PDF and ePub downloads, according to the available data) and Abstracts Views on Vision4Press platform.

Data correspond to usage on the plateform after 2015. The current usage metrics is available 48-96 hours after online publication and is updated daily on week days.

Initial download of the metrics may take a while.