Stella binaria

Si definisce stella binaria un sistema stellare formato da due stelle che orbitano intorno al loro comune centro di massa; la stella più luminosa viene chiamata primaria, mentre l'altra viene chiamata compagna o secondaria. Le osservazioni compiute sin dall'Ottocento fanno pensare che siano molte le stelle a far parte di sistemi binari o di sistemi multipli, composti da più di due stelle. Il termine stella doppia è a volte utilizzato quale sinonimo di stella binaria, ma talvolta indica sia le stelle binarie fisicamente legate fra loro sia le binarie ottiche, ovvero coppie di stelle che appaiono vicine se osservate dalla Terra, ma che non hanno alcun legame gravitazionale fra loro. Si può verificare se una stella doppia è ottica qualora le due componenti abbiano valori di moto proprio o velocità radiale sufficientemente distinti, oppure quando le misurazioni della parallasse rivelano che esse hanno distanze differenti dalla Terra. Esistono però molte stelle doppie per le quali non è stato ancora possibile determinare se si tratti di binarie fisicamente legate oppure solo di doppie apparenti.

Uses material from the Wikipedia article "Stella binaria", which is released under the Creative Commons BY-SA 3.0.
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18 AquilaeStella binariaB699[x]
2 LyncisStella binariaA157
2MASS J02211701+5708426Stella binariaB7647
2MASS J02220081+5707320Stella binariaB7691
2MASS J18504102-0621530Eclipsing binary of W UMa type (contact binary)6182
42 CassiopeiaeEclipsing binary of Algol type (detached)B278
57 CygniEclipsing binary of Algol type (detached)B525
71 DraconisEclipsing binary of Algol type (detached)B378
75 PegasiEclipsing binary of beta Lyr type (semi-detached)A233
AE FornacisEclipsing binary of Algol type (detached)K103
Ah AurigaeEclipsing binary of W UMa type (contact binary)G331
AlgolEclipsing binary of Algol type (detached)B93[x]
Alpha OctantisEclipsing binary of beta Lyr type (semi-detached)F143
AR CassiopeiaeEclipsing binary of Algol type (detached)B621
BE SculptorisEclipsing binary of W UMa type (contact binary)F1077
BX PegasiEclipsing binary of W UMa type (contact binary)G532
CM DraconisStella binariaM48
CU CancriStella binariaM29
Deneb AlgediEclipsing binary of Algol type (detached)39[x]
DP CamelopardalisStella binariaK94
EGM 823Stella binariaK77
EO AurigaeEclipsing binary of Algol type (detached)B1539
EQ TauriEclipsing binary of W UMa type (contact binary)G468
ER VulpeculaeEclipsing binary of Algol type (detached), Eclipsing binary of W UMa type (contact binary)G170
ET LeonisEclipsing binary of W UMa type (contact binary)G234
GR VirginisStella binaria, Eclipsing binary of W UMa type (contact binary)G166
Groombridge 34Stella binariaM12[x]
HD 123779Eclipsing binary of beta Lyr type (semi-detached)B2026
HD 151564Eclipsing binary of Algol type (detached)B1822
HD 155550Eclipsing binary of Algol type (detached)B2039
HD 166226Stella binariaB1469
HD 167971Eclipsing binary of beta Lyr type (semi-detached)O2160
HD 171060Stella binaria, Eclipsing binary of Algol type (detached)B1568
HD 193576Eclipsing binary of Algol type (detached)W2077
HD 208496Eclipsing binary of Algol type (detached)F219
HD 218066Eclipsing binary of Algol type (detached)B2077
HD 228911Eclipsing binary of Algol type (detached)B2052
HD 25799Stella binariaB1036
HD 27546Eclipsing binary of Algol type (detached)B1110
HIP 100253Eclipsing binary of beta Lyr type (semi-detached)A467
HIP 10099Eclipsing binary of Algol type (detached)A260
HIP 101341Eclipsing binary of beta Lyr type (semi-detached)O2146
HIP 104478Eclipsing binary of beta Lyr type (semi-detached)G458
HIP 104604Eclipsing binary of Algol type (detached)F158
HIP 105404Eclipsing binary of beta Lyr type (semi-detached)G147
HIP 10579Eclipsing binary of Algol type (detached)G189
HIP 108859Star showing eclipses by its planetG162
HIP 10961Eclipsing binary of Algol type (detached)F200
HIP 109642Eclipsing binary of Algol type (detached)F228
HIP 118223Eclipsing binary of Algol type (detached)A673
HIP 1550Eclipsing binary of Algol type (detached)B516
HIP 17704Eclipsing binary of Algol type (detached)A346
HIP 17962Stella binaria, Eclipsing binary of Algol type (detached)K144
HIP 17988Eclipsing binary of beta Lyr type (semi-detached)F224
HIP 18972Eclipsing binary of Algol type (detached)B677
HIP 20019Stella binaria, Eclipsing binary of Algol type (detached), Eclipsing binary of W UMa type (contact binary)G150
HIP 20806Eclipsing binary of Algol type (detached)G162
HIP 22229Eclipsing binary of Algol type (detached)F203
HIP 22524Stella binariaF169
HIP 24019Stella binariaA178
HIP 24221Stella binariaF200
HIP 24710Eclipsing binary of Algol type (detached)K171
HIP 25591Eclipsing binary of Algol type (detached)A755
HIP 27341Eclipsing binary of Algol type (detached)A669
HIP 30878Eclipsing binary of Algol type (detached)F247
HIP 31383Eclipsing binary of Algol type (detached)B738
HIP 33303Eclipsing binary of W UMa type (contact binary)F249
HIP 33890Eclipsing binary of Algol type (detached)B893
HIP 41322Stella binaria, Eclipsing binary of Algol type (detached)K149
HIP 41564Eclipsing binary of Algol type (detached)A243
HIP 42753Stella binaria, Eclipsing binary of Algol type (detached)F164
HIP 4332Eclipsing binary of Algol type (detached)G243
HIP 4974Eclipsing binary of Algol type (detached)F235
HIP 5391Stella binaria, Eclipsing binary of Algol type (detached)B1231
HIP 62913Stella binariaB6405
HIP 66433Stella binariaA265
HIP 67527Eclipsing binary of Algol type (detached)G192
HIP 70287Eclipsing binary of Algol type (detached)A406
HIP 7148Eclipsing binary of beta Lyr type (semi-detached)A312
HIP 75818Stella binariaF197
HIP 82691Eclipsing binary of beta Lyr type (semi-detached)O4056
HIP 83891Eclipsing binary of Algol type (detached)A590
HIP 83943Eclipsing binary of beta Lyr type (semi-detached)B909
HIP 8693Stella binaria, Eclipsing binary of Algol type (detached)B1106
HIP 88637Stella binariaG129
HIP 95163Eclipsing binary of Algol type (detached)B626
HIP 96515Stella binaria, Eclipsing binary of Algol type (detached)M144
HIP 98028Stella binariaA444
HIP 98955Eclipsing binary of Algol type (detached)A688
HM BootisStella binariaK120
HR 1056Eclipsing binary of Algol type (detached)A487
HR 2280Stella binariaA334
HR 5687Eclipsing binary of Algol type (detached)B547
HR 6240Eclipsing binary of beta Lyr type (semi-detached)A242
HR 6327Eclipsing binary of Algol type (detached)F211
HR 6662Eclipsing binary of Algol type (detached)B1029
HR 7174Eclipsing binary of Algol type (detached)B579
HR 7484Eclipsing binary of Algol type (detached)F133
HR 9049Eclipsing binary of Algol type (detached)B884
i BootisEclipsing binary of W UMa type (contact binary)G42[x]
II Ursae MajorisEclipsing binary of W UMa type (contact binary)F529
IL Canis MajorisStella binariaB841
IS Canis MajorisEclipsing binary of W UMa type (contact binary)F333
LP 54-19Stella binariaM70
LW CentauriEclipsing binary of beta Lyr type (semi-detached)B5973
MintakaStella binaria, Eclipsing binary of Algol type (detached)B693[x]
Mu AquariiEclipsing binary of W UMa type (contact binary)157
MU CassiopeiaEclipsing binary of Algol type (detached), Eclipsing binary of beta Lyr type (semi-detached)A40
OGLE-TR-113Star showing eclipses by its planetK1800
OU SerpentisEclipsing binary of W UMa type (contact binary)G176
QW TelescopiiEclipsing binary of beta Lyr type (semi-detached), Eclipsing binary of W UMa type (contact binary)F297
QZ CarinaeEclipsing binary of beta Lyr type (semi-detached)O1953[x]
R Canis MajorisEclipsing binary of Algol type (detached)F139[x]
RR CaeliStella binaria, Eclipsing binary of Algol type (detached)D27[x]
RR CentauriEclipsing binary of W UMa type (contact binary)A321
RS SagittariiEclipsing binary of Algol type (detached)B1113
RuchbahEclipsing binary of Algol type (detached)A100
RW DoradusEclipsing binary of W UMa type (contact binary)G308
RZ CassiopeiaeEclipsing binary of Algol type (detached)A212
RZ Comae BerenicesStella binaria, Eclipsing binary of W UMa type (contact binary)G614
TW CetiEclipsing binary of W UMa type (contact binary)G272
ux eridaniEclipsing binary of W UMa type (contact binary)F663
V0502 OphiuchiiEclipsing binary of W UMa type (contact binary)G280
V0566 OphiuchiiEclipsing binary of W UMa type (contact binary)F246
V0759 CentauriEclipsing binary of W UMa type (contact binary)G188
V0972 HerculisEclipsing binary of beta Lyr type (semi-detached), Eclipsing binary of W UMa type (contact binary)F206
V1034 ScorpiiStella binaria, Eclipsing binary of Algol type (detached)O4157
V1208 ScorpiiStella binariaB4198
V1292 ScorpiiEclipsing binary of Algol type (detached)O4102
V5563 SagittariiEclipsing binary of W UMa type (contact binary)B4423
V640 CassiopeiaStella binariaG70
V773 CassiopeiaeEclipsing binary of Algol type (detached)A277
V842 HerculisEclipsing binary of W UMa type (contact binary)G536
V902 CentauriStella binariaF90
VV CepheiEclipsing binary of Algol type (detached)M2452[x]
VV OrionisEclipsing binary of Algol type (detached)B1469[x]
VW CephiEclipsing binary of W UMa type (contact binary)G90
VW Leonis MinorisEclipsing binary of W UMa type (contact binary)F437
W Ursae MajorisStella binaria, Eclipsing binary of W UMa type (contact binary)F162[x]
Wolf 225Stella binariaK80
WW AurigaeEclipsing binary of Algol type (detached)A263
XY LeonisEclipsing binary of W UMa type (contact binary)K206
YY EridaniEclipsing binary of W UMa type (contact binary)G198