次矮星，有時標示為sd，是淤積斯光譜分類系統中光度屬於VI的恆星，它們是絕對星等的光度比主序星低1.5至2等，但光譜型態相同的恆星。在赫羅圖上，次矮星的位置在主序帶的下方。
次矮星這個名詞是古柏在1939年創造的，是用來標示之前被稱為“中繼白矮星”，卻有著異常光譜的恆星[1]。
像正常的主序恆星一樣，冷的次矮星（光譜類型從G至M）以氫的融合產生能量，它們的低光度是以它們的低金屬量來解釋：這些恆星缺乏比氦重的元素，較低的金屬量降低了外層的不透明度，和使輻射壓減低，結果是質量相同的恆星變得較小和較熱[2]。 這種較低的不透明度也使得相同光譜類型的恆星輻射出紫外線的百分比較第一星族星高，成為紫外線超出的恆星[3]。通常銀河系暈的成員，它們相對於太陽經常有較高的空間相對速度。尚未發現有行星環繞著次矮星公轉。
冷的次矮星還有次分類如下[4]：
熱的次矮星，光譜類型為O和B，也稱為極端水平分支星，是和冷的次矮星完全不同的類別的天體。這些恆星代表一些恆星發展的晚期階段，起因於在核心開始融合氦之前，紅巨星已經失去它外面的氫層。雖然還不清楚這些過早失去的質量發生的原因，但是在聯星系統內的交互作用被認為是主要的機制之一。單獨的次矮星被認為是兩顆白矮星合併的結果。比白矮星明亮許多的B型次矮星，分布在老的恆星系統中，像是球狀星團和橢圓星系，是主要成員的元素.[5]。
Artikel ini membutuhkan rujukan tambahan agar kualitasnya dapat dipastikan. Mohon bantu kami mengembangkan artikel ini dengan cara menambahkan rujukan ke sumber tepercaya. Pernyataan tak bersumber bisa saja dipertentangkan dan dihapus.Cari sumber: Zainal Mustafa – berita · surat kabar · buku · cendekiawan · JSTOR KH. Zainal MusthofaLahir(1899-01-01)1 Januari 1899 Singaparna, Tasikmalaya, Hindia BelandaMeninggal28 Oktober 1944(1944-10-28) (umur 45) Ja…
artikel ini perlu dirapikan agar memenuhi standar Wikipedia. Tidak ada alasan yang diberikan. Silakan kembangkan artikel ini semampu Anda. Merapikan artikel dapat dilakukan dengan wikifikasi atau membagi artikel ke paragraf-paragraf. Jika sudah dirapikan, silakan hapus templat ini. (Pelajari cara dan kapan saatnya untuk menghapus pesan templat ini) Artikel ini bukan mengenai Vidio. Tiga macam sinyal video analog yang dipakai di seluruh dunia: NTSC, PAL, SECAM Video adalah suatu bentuk media visu…
Marriage RecordsFounded2001 (2001)FounderCurtis KnappAdrian OrangeDistributor(s)Nail, Southern Records, Chicago Independent, Revolver, The BusinessGenreIndie, experimental, electronic, freak folk, alt folkCountry of originU.S.LocationPortland, Oregon, Los AngelesOfficial websitewww.marriagerecs.com Marriage Records is a small, independent record label formed in Portland, Oregon. It was founded in 2001 by Curtis Knapp and Adrian Orange. The label has released a number of albums by musicians …
Битва при ОтумбеОсновной конфликт: Завоевание Мексики Битва при Отумбе на картине XVII века Дата 7 июля 1520 года Место равнина Отумба, Мексика Итог Победа конкистадоров Противники Испания Тласкала Ацтекская империя Командующие Эрнан Кортес Куитлауак Силы сторон менее 1000 ок.…
Para otros usos de este término, véase Benín (desambiguación). República Popular de BenínRépublique populaire du Bénin Estado desaparecido 1975-1990BanderaEscudo Himno: L'Aube Nouvelle Ubicación de República Popular de BenínCoordenadas 6°30′N 2°36′E / 6.5, 2.6Capital Porto NovoEntidad Estado desaparecidoIdioma oficial francésPoblación (1975) • Total 3 262 959 hab.Religión Ateísmo de EstadoMoneda Franco CFAPeríodo histórico …
Esta página cita fontes, mas que não cobrem todo o conteúdo. Ajude a inserir referências. Conteúdo não verificável pode ser removido.—Encontre fontes: ABW • CAPES • Google (N • L • A) (Junho de 2021) Nina Zilli Nina Zilli Informação geral Nome completo Maria Chiara Fraschetta Nascimento 2 de fevereiro de 1980 (43 anos)Placência, Emília-Romanha Itália País Itália Gênero(s) Soul, R&B, Reggae, Pop Oc…
BrachytrachelopanStatus: Uitgestorven, als fossiel bekend Brachytrachelopan Taxonomische indeling Rijk:Animalia (Dieren)Stam:Chordata (Chordadieren)Klasse:Reptilia (Reptielen)Superorde:Dinosauria (Dinosauriërs)Orde:SaurischiaOnderorde:SauropodomorphaInfraorde:SauropodaSuperfamilie:DiplodocoideaFamilie:Dicraeosauridae Geslacht BrachytrachelopanRauhut et al., 2005 Typesoort Brachytrachelopan mesai Afbeeldingen op Wikimedia Commons Brachytrachelopan op Wikispecies Portaal Biologie Her…
Alex YoongLahir20 Juli 1976 (umur 47)Karier Kejuaraan Dunia Formula SatuKebangsaan MalaysiaTahun aktif2001–2002TimMinardiJumlah lomba18 (14 starts)Juara dunia0Menang0Podium0Total poin0Posisi pole0Lap tercepat0Lomba pertamaGrand Prix Italia 2001Lomba terakhirGrand Prix Jepang 2002 Alexander Charles Loong Yoong[1] (alias Alex Yoong, lahir 20 Juli 1976) adalah seorang pembalap mobil professional asal Malaysia. Alex Yoong sempat merasakan ketatnya persaingan di arena Formula 1. I…
Historic house in Asheville, North Carolina United States historic placeSmith-McDowell HouseU.S. National Register of Historic Places Smith-McDowell HouseShow map of North CarolinaShow map of the United StatesLocation283 Victoria Road, Asheville, North Carolina, USCoordinates35°34′23″N 82°33′18″W / 35.57306°N 82.55500°W / 35.57306; -82.55500Builtc. 1840Architectural styleGreek RevivalNRHP reference No.75001243 [1]Added to NRHPAugust 1, 1…
2009 science fiction drama film directed by Jaco Van Dormael Mr. NobodyTheatrical release posterDirected byJaco Van DormaelWritten byJaco Van DormaelProduced byPhilippe GodeauStarring Jared Leto Sarah Polley Diane Kruger Linh Dan Pham Rhys Ifans Natasha Little CinematographyChristophe BeaucarneEdited byMatyas Veress Susan ShiptonMusic byPierre Van DormaelProductioncompanyPan-EuropéenneDistributed byBelga Films (Belgium)[1]Les Films Séville (Canada)[1]Pathé Distribution (France…
Parliamentary constituency in the United Kingdom, 1983–1997 Southwark and BermondseyFormer Borough constituencyfor the House of CommonsCountyGreater LondonMajor settlementsBermondsey, Rotherhithe1983–1997SeatsOneCreated fromBermondsey (vast bulk of)Peckham (small part of)[1]Replaced byNorth Southwark and Bermondsey Southwark and Bermondsey was an inner city constituency in London, United Kingdom. Its sole Member of Parliament was Simon Hughes, in the first stage of his career in the …
2019 studio album by PharmakonDevourStudio album by PharmakonReleasedAugust 30, 2019 (2019-08-30)Length36:05LabelSacred BonesPharmakon chronology Contact(2017) Devour(2019) Singles from Devour Self-Regulating SystemReleased: July 9, 2019 Professional ratingsAggregate scoresSourceRatingMetacritic83/100[1]Review scoresSourceRatingAllMusic[2]Exclaim!8/10[3]Pitchfork7.9/10[4] Devour is the fourth studio album by musician Margaret Chardiet under …
Artikel ini sebatang kara, artinya tidak ada artikel lain yang memiliki pranala balik ke halaman ini.Bantulah menambah pranala ke artikel ini dari artikel yang berhubungan atau coba peralatan pencari pranala.Tag ini diberikan pada November 2022. MilarepaSutradara Neten Chokling Produser Raymond Steiner Norbu Gyari Ditulis oleh Neten Chokling Tenzing Choyang Gyari PemeranJamyang Lodro sebagai ThopagaGimyan Lodro sebagai MilarepaOrgyen Tobgyal sebagai Yongten TrogyalKelsang Chukie Tethong sebagai …
French African colonies after World War II. French West Africa in dark green. Following is a list of senators of French West Africa, people who represented the colonies in French West Africa in the Senate of France during the French Fourth Republic (1945–1959). All of these colonies became independent countries between 1958 and 1960. Dahomey Location of Dahomey Senators for Dahomey (now Benin) under the French Fourth Republic were:[1] In office Name Group Notes 1947–1955 Louis Ignaci…
Dinas Luar Negeri Eropa Bulgaria: Европейска служба за външна дейност Kroasi: Europska služba vanjskih poslova Ceko: Evropská služba pro vnější činnost Denmark: Tjenesten for EU's optræden udadtil Belanda: Europese dienst voor extern optreden Inggris: European External Action Service Estonia: Euroopa välisteenistus Finlandia: Euroopan ulkosuhdehallinto Prancis: Service européen pour l'action extérieure Jerman: Europäischer Auswärtiger Dienst Yunani: Ε…
Sir Henry d'Esterre Darby, by Sir William Beechey, 1801 Admiral Sir Henry D'Esterre Darby, KCB (9 April 1749 – 30 March 1823) was an officer in the Royal Navy. He was the third son of Jonathan and Susannah Darby of Leap Castle, in King's County, Ireland. He was the nephew of Vice Admiral George Darby.[1][2] Darby first went to sea when he was thirteen but it was another fourteen years before he made lieutenant, aboard his uncle's ship HMS Britannia. In 1781, he was given c…
العلاقات الدومينيكية الشمال مقدونية دومينيكا شمال مقدونيا دومينيكا شمال مقدونيا تعديل مصدري - تعديل العلاقات الدومينيكية الشمال مقدونية هي العلاقات الثنائية التي تجمع بين دومينيكا وشمال مقدونيا.[1][2][3][4][5] مقارنة بين البلدين هذه مقارن…
Associação das Universidades de Língua Portuguesa(AULP) Associação das Universidades de Língua Portuguesa Países onde o português é a língua oficial. Tipo Organização não governamental internacional Fundação 26 de novembro de 1986[1] Sede Lisboa, Portugal Línguas oficiais Português Sítio oficial aulp.org A Associação das Universidades de Língua Portuguesa (AULP) é uma entidade que congrega instituições de ensino superior de língua portuguesa no mundo. Preconiza a criaç…
Short story by Kenneth Grahame The Reluctant Dragon is an 1898 children's story by Kenneth Grahame, originally published as a chapter in his book Dream Days. It is Grahame's most famous short story, arguably better known than Dream Days itself or the related 1895 collection The Golden Age.[1] It can be seen as a prototype to most modern stories in which the dragon is a sympathetic character rather than a threat.[2] Plot Illustration from Dream Days (1902) by Maxfield Parrish The …
Боевой модуль БАУ 23×2 на выставке «Зброя та безпека-2016» БАУ-23×2 — это одноместный башенный боевой модуль украинского производства, предназначенный для установки на бронетранспортёры и бронемашины массой не менее шести тонн[1]. Является одним из первых украинских бо…
Lokasi Pengunjung: 18.218.117.71