Henrietta Swan Leavitt

Henrietta Swan Leavitt(Julaị 4, 1868 – Disemba 12, 1921) bụ onye na-enyocha mbara igwe nke America bụ onye chọpụtara mmekọrịta dị n'etiti ìhè na oge kpakpando agbanwe agbanwe Cepheid. O mere nchọpụta a, n'etiti ndị ọzọ, mgbe ọ na-arụrụ ọrụ na Harvard College Observatory dị ka kọmputa mmadụ na-enyocha efere foto iji tụọ na katalọgụ nchapụta nke kpakpando.

Okwu okwuru

• ' Okwesiri ka a mara na na Tebụl VI mgbanwe ndị na-egbuke egbuke nwere ogologo oge. nke na-agafe mgbanwe ha n'otu ụbọchị ma ọ bụ abụọ.
  • "1777 Variables in the Magellanic Clouds" (1908) Annals of the Astronomical Observatory of Harvard College Vol.60. Nọmba.4

Fig.5 H 1255 "kpakpando iri dị iche iche nke ụdị Algol" Ogologo oge mkpebi dị elu maka axis kwụ ọtọ, na-adabere na oke kacha nta

Fig.6 H 1255 "kpakpando iri dị iche iche nke ụdị Algol" Ogologo oge mkpebi dị ala maka axis kwụ ọtọ, na-adabere na oke kachasị

• Nchọpụta nke kpakpando ndị na-agbanwe agbanwe', na Observatory a na n'ebe ndị ọzọ, 'aga n'ihu ngwa ngwa n'ime afọ ise gara aga, na ihe isi ike nke ịga n'ihu n'ikiri na ikwurịta ha aghọwo nnukwu ihe. ' N'ime ọmụmụ nke nkesa ugbu a na-aga n'ihu ebe a, kpọmkwem oge a na-etinye maka ịchọta mgbanwe ọhụrụ dị ntakịrị, ma nleba anya nke ọma na-achọ oge dị ukwuu, ebe mkparịta ụka nke nsonaazụ nwere ike ịgbatị ihe fọrọ nke nta ka ọ bụrụ mgbe ebighị ebi. Mgbe ọhụrụ. A na-ebipụta ndepụta nke mgbanwe dị iche iche, ya mere, ekwesịrị icheta na nchọpụta ha adịghị egbochi ihe onwunwe n'ọmụmụ ihe nke onye ọ bụla. Ọnụ ọgụgụ nke ndị a buru ibu nke na mbipụta nke nsonaazụ zuru oke maka mmadụ niile ga-egbu oge nke ukwuu.
  • "Ten Variable Stars of the Algol Type" (1908) Annals of the Astronomical Observatory of Harvard College Vol.60. Nọmba.5

• O doro anya na enweghị ahịrị nkewa dị nkọ nke a ga-esere n'etiti kpakpando eziokwu Algol na ndị ọdịiche ha na-aga n'ihu. Oge nke mgbanwe itoolu na mpaghara a, bụ nke ụdị Algol ma ọ bụ nke yiri ya, ekpebiela ma a tụlere ya ebe a.
  • " Kpakpando iri na-agbanwe agbanwe nke ụdị Algol" (1908) Annals of the Astronomical Observatory of Harvard College Vol.60. Nke 5
• Oke nke H 1255 bụ naanị ụzọ anọ n'ụzọ iri nke ịdị ukwuu, na n'ihi nchapụta ya, ọ na-esiri ike ịhụ na efere niile ma ewezuga ndị ejiri oghere Cooke 1-inch were. Ya mere, ọ dị mkpa ka a kpachapụ anya na-adịghị ahụkebe iji nweta nleba anya ziri ezi, na inye onye nke ọ bụla n'ime ha n'uju ya. N'ihi nke a, a họrọla foto narị na iri atọ na isii, gụnyere ihe fọrọ nke nta ka ọ bụrụ ndị niile e ji oghere Cooke were, yanakwa ndị ejiri igwe onyonyo Bache dị inch 8, nke mgbanwe ahụ na-ada mbà n'ezie. A na-eme atụmatụ nchapụta anọ nwere onwe ya na efere ọ bụla, wee were ụzọ, si otú a belata njehie ahụ nwere ike ịbụ otu ọkara. A na-agbakọ usoro ahụ maka nlele ọ bụla, si otú a na-ekpuchi akụkụ niile nke ọkụ ọkụ. ...H 1255 na H 1303 dị iche na mgbanwe ndị ọzọ na akara akara dị ka n'ọnọdụ ọ bụla ogologo oge nke opekempe dị ogologo n'ogo ogologo oge. Eziokwu a butere ihe isi ike dị ukwuu n'ịchọpụta oge ha n'ihi na o doro anya na ha nọ na nchapụta kacha nta ruo oge ụfọdụ tupu na mgbe obere ntakịrị mere. Na H 1255, mgbanwe nke nchapụta doro anya na-aga n'ihu n'ime oge niile, n'agbanyeghị na ọ na-adị ngwa ngwa karịa nke kacha nso. A na-ahụ nke a nke ọma na Plate IV, fig. 5 na 6.
  • "Ten Variable Stars of the Algol Type" (1908) Annals of the Astronomical Observatory of Harvard College Vol.60. Nke 5

Oge 25 mgbanwe mgbanwe na Obere igwe ojii Magellanic (1912)

<obere>ya na Edward C. Pickering, Harvard College Observatory Circular, vol. 173, p.1-3</ obere>

Fig.1 Eserese dị iche iche maka oke Cepheid kachasị na kacha nta, yana Oge n'ime ụbọchị n'akụkụ axis kwụ ọtọ & ịdị ukwuu pụtara ìhè n'akụkụ kwụ ọtọ

Fig.2, "Oge nke kpakpando 25 agbanwe agbanwe na obere igwe ojii Magellanic" dị ka Fig.1 mana nwere oge logarithmically gbanyere mkpọrọgwụ na axis kwụ ọtọ

• Mmekọrịta dị ịrịba ama n'etiti nchapụta nke [Cepheid] mgbanwe na ogologo oge ha ga-achọpụta. Na H.A. 60, No.4, a na-akpọ nlebara anya n'eziokwu na mgbanwe ndị na-egbuke egbuke nwere ogologo oge, ma n'oge ahụ, a na-eche na ọnụ ọgụgụ ahụ dị ntakịrị na ịbịaru nkwubi okwu n'ozuzu ya. Oge nke mgbanwe 8 ọzọ nke ekpebiela kemgbe oge ahụ, agbanyeghị, dabara n'otu iwu ahụ. E gosipụtara njikọ ahụ n'ụzọ eserese na eserese 1 ... Ụzọ abụọ na-esi na ya pụta, otu maka maxima na otu maka minima, dị ịtụnanya na-adịghị mma, na ọdịdị dị ịrịba ama. Na eserese 2, abscissas hà nhata na logarithms nke oge, na ordinates na nha nha nhata, dị ka na eserese 1. Enwere ike ịdọrọ eriri kwụ ọtọ n'etiti nke ọ bụla n'ime usoro abụọ nke isi ihe kwekọrọ na maxima. na minima, si otú a na-egosi na e nwere njikọ dị mfe n'etiti nchapụta nke mgbanwe na ha oge. Logarithm nke oge ahụ na-abawanye ihe dịka 0.48 maka mmụba ọ bụla nke otu oke na nchapụta.

• Ebe [Cepheid] mgbanwe dị n'ihe fọrọ nke nta ka ọ bụrụ otu ebe site na Ụwa, o doro anya na oge ha jikọtara ya na npụpụ ìhè ha n'ezie ', dị ka ekpebie site na oke ha, njupụta na nchapụta elu ha.

• A ga-atụkwa anya, na parallaxes nke ụfọdụ mgbanwe nke ụdị a nwere ike tụọ.

• A na-atụ anya na a ga-eme n'oge na-adịghị anya n'oge na-adịghị anya, ọmụmụ ihe n'usoro nke ìhè mgbanwe nke mgbanwe niile, ihe fọrọ nke nta ka ọ bụrụ puku abụọ n'ọnụ ọgụgụ, n'ime abụọ Magellanic Cloud n'oge na-adịghị anya.

Njiko Mpuga

• H.S. Leavitt, "The North Polar Sequence" (1917) No.3 in Annals of the Astronomical Observatory of Harvard College Vol.71 Miscellaneous Observations Relating to Photographic Magnitudes
• H.S. Leavitt, "Periods of 25 Variable Stars in the Small Magellanic Cloud" Harvard College Observation Circular, Issues 151-200 @GoogleBooks
• P.E. Robinson, "Introductory Astronomy: Galaxy Distances and Lookback Time" video includes Leavitt's contribution